diff --git a/src/components/Event/Event.tsx b/src/components/Event/Event.tsx
index 98703ad..38e4553 100644
--- a/src/components/Event/Event.tsx
+++ b/src/components/Event/Event.tsx
@@ -1,3 +1,4 @@
+import * as immutable from 'immutable';
 import { useCallback, useEffect, useRef, useState } from 'react';
 import { green, lightgrey } from '../../lib/colors';
 import {
@@ -35,6 +36,7 @@ export default function Event({
 	const [interested, setInterested] = useState(false);
 	const [updating, setUpdating] = useState(false);
 	const [signups, setSignups] = useState<IEventSignup[] | null>(null);
+	const [hasCarpool, setHasCarpool] = useState(false);
 	const toggleInterested = useCallback(() => setInterested((i) => !i), []);
 	const toggleInterestedThrottled = useThrottle(toggleInterested, 500);
 	const existingSignup = useRef({
@@ -44,6 +46,18 @@ export default function Event({
 	});
 	const me = useMe();
 
+	const [tentativeInvites, setTentativeInvites] = useState(
+		immutable.Set<number>()
+	);
+
+	const addTentativeInvite = useCallback((userId: number) => {
+		setTentativeInvites((t) => t.add(userId));
+	}, []);
+
+	const removeTentativeInvite = useCallback((userId: number) => {
+		setTentativeInvites((t) => t.delete(userId));
+	}, []);
+
 	const refresh = useCallback(() => {
 		getEvent(id).then(setEvent);
 	}, [id]);
@@ -116,7 +130,19 @@ export default function Event({
 	const { name, group, formattedAddress, startTime, endTime } = event;
 
 	return (
-		<EventContext.Provider value={{ event, refresh, default: false }}>
+		<EventContext.Provider
+			value={{
+				event,
+				refresh,
+				default: false,
+				addTentativeInvite,
+				removeTentativeInvite,
+				tentativeInvites,
+				signups,
+				hasCarpool,
+				setHasCarpool,
+			}}
+		>
 			<UISecondaryBox>
 				<div style={{ textAlign: 'center' }}>
 					<UISecondaryHeader>{name}</UISecondaryHeader>
@@ -146,11 +172,7 @@ export default function Event({
 						<br />
 						<EventCarpools />
 						{signups !== null && (
-							<EventSignups
-								event={event}
-								myPlaceId={placeId}
-								signups={signups}
-							/>
+							<EventSignups myPlaceId={placeId} signups={signups} />
 						)}
 					</>
 				)}
diff --git a/src/components/Event/EventCarpools.tsx b/src/components/Event/EventCarpools.tsx
index 4702251..0dd2a1f 100644
--- a/src/components/Event/EventCarpools.tsx
+++ b/src/components/Event/EventCarpools.tsx
@@ -1,6 +1,7 @@
 import CancelIcon from '@material-ui/icons/Cancel';
 import CheckIcon from '@material-ui/icons/Check';
 import EmojiPeopleIcon from '@material-ui/icons/EmojiPeople';
+import { useEffect } from 'react';
 import { useCallback, useContext, useMemo, useState } from 'react';
 import { lightgrey } from '../../lib/colors';
 import {
@@ -91,7 +92,8 @@ function CarpoolRow({
 type CreationStatus = null | 'pending' | 'completed' | 'errored';
 
 export default function Carpools() {
-	const { event } = useContext(EventContext);
+	const { event, tentativeInvites, signups, setHasCarpool } =
+		useContext(EventContext);
 	const [creationStatus, setCreationStatus] = useState<CreationStatus>(null);
 	const [createdCarpoolId, setCreatedCarpoolId] = useState<null | number>(null);
 
@@ -106,6 +108,10 @@ export default function Carpools() {
 	const alreadyInCarpool =
 		myCarpool !== undefined || creationStatus === 'completed';
 
+	useEffect(() => {
+		setHasCarpool(alreadyInCarpool);
+	}, [alreadyInCarpool, setHasCarpool]);
+
 	const createEmptyCarpool = useCallback(() => {
 		setCreationStatus('pending');
 
@@ -119,6 +125,55 @@ export default function Carpools() {
 			});
 	}, [event.id, me.name]);
 
+	const tentativeInviteNames = useMemo(() => {
+		if (!signups) return [];
+		const names = tentativeInvites.map((id) => {
+			const signup = signups.find((s) => s.user.id === id);
+			return signup?.user.name;
+		});
+		const nonNull = names.filter((n) => n != null);
+		return nonNull.toArray() as string[];
+	}, [tentativeInvites, signups]);
+
+	let createCarpoolSection;
+
+	if (tentativeInviteNames.length > 0) {
+		const inviteeCount = tentativeInviteNames.length;
+		const peoplePlural = inviteeCount > 1 ? 'People' : 'Person';
+		createCarpoolSection = (
+			<>
+				<br />
+				<b>You have invited these people to carpool with you:</b>
+				{tentativeInviteNames.join(',')}
+				<UIButton
+					onClick={createEmptyCarpool}
+					style={{ backgroundColor: lightgrey }}
+				>
+					{creationStatus === null
+						? `Create Carpool With ${inviteeCount} ${peoplePlural}`
+						: creationStatus === 'pending'
+						? 'Creating...'
+						: 'Errored'}
+				</UIButton>
+			</>
+		);
+	} else
+		createCarpoolSection = (
+			<>
+				<span>Available to drive?</span>
+				<UIButton
+					onClick={createEmptyCarpool}
+					style={{ backgroundColor: lightgrey }}
+				>
+					{creationStatus === null
+						? 'Create Empty Carpool'
+						: creationStatus === 'pending'
+						? 'Creating...'
+						: 'Errored'}
+				</UIButton>
+			</>
+		);
+
 	return (
 		<div style={{ display: 'flex', flexDirection: 'column' }}>
 			<h3 style={{ marginBottom: '0' }}>Carpools</h3>
@@ -133,19 +188,7 @@ export default function Carpools() {
 					<UILink href={`/carpools/${myCarpool.id}`}>{myCarpool.name}</UILink>
 				</span>
 			) : (
-				<>
-					<span>Available to drive?</span>
-					<UIButton
-						onClick={createEmptyCarpool}
-						style={{ backgroundColor: lightgrey }}
-					>
-						{creationStatus === null
-							? 'Create Empty Carpool'
-							: creationStatus === 'pending'
-							? 'Creating...'
-							: 'Errored'}
-					</UIButton>
-				</>
+				createCarpoolSection
 			)}
 			{event.carpools.map((carpool) => (
 				<CarpoolRow
diff --git a/src/components/Event/EventContext.tsx b/src/components/Event/EventContext.tsx
index 40633da..1da0402 100644
--- a/src/components/Event/EventContext.tsx
+++ b/src/components/Event/EventContext.tsx
@@ -1,5 +1,6 @@
 import { createContext } from 'react';
-import { IEvent } from '../types';
+import { IEvent, IEventSignup } from '../types';
+import * as immutable from 'immutable';
 
 const EventContext = createContext({
 	refresh: () => {
@@ -7,6 +8,18 @@ const EventContext = createContext({
 	},
 	event: null! as IEvent,
 	default: true,
+	signups: null as IEventSignup[] | null,
+	addTentativeInvite: (id: number) => {
+		console.error('not implemented: addTentativeInvite');
+	},
+	removeTentativeInvite: (id: number) => {
+		console.error('not implemented: removeTentativeInvite');
+	},
+	tentativeInvites: immutable.Set<number>(),
+	hasCarpool: false,
+	setHasCarpool: (has: boolean) => {
+		console.error('not implemented: setHasCarpool');
+	},
 });
 
 export default EventContext;
diff --git a/src/components/Event/EventSignups.tsx b/src/components/Event/EventSignups.tsx
index 643ebcb..f847ada 100644
--- a/src/components/Event/EventSignups.tsx
+++ b/src/components/Event/EventSignups.tsx
@@ -1,24 +1,124 @@
+import CancelIcon from '@material-ui/icons/Cancel';
 import PersonAddIcon from '@material-ui/icons/PersonAdd';
-import { useMe } from '../hooks';
+import { useContext, useMemo } from 'react';
+import { PlaceDetails } from '../../lib/getPlaceDetails';
 import latlongdist, { R_miles } from '../../lib/latlongdist';
-import { IEventSignup, IEvent } from '../types';
+import { useMe } from '../hooks';
+import { IEventSignup } from '../types';
 import usePlace from '../usePlace';
-import { useMemo } from 'react';
+import EventContext from './EventContext';
+
+function EventSignup({
+	signup,
+	locationLatitude,
+	locationLongitude,
+	myPlaceDetails,
+}: {
+	signup: IEventSignup;
+	locationLatitude: number;
+	locationLongitude: number;
+	myPlaceDetails: PlaceDetails | null;
+}) {
+	const { user, latitude, longitude } = signup;
+	const me = useMe();
+	const {
+		addTentativeInvite,
+		removeTentativeInvite,
+		tentativeInvites,
+		hasCarpool,
+	} = useContext(EventContext);
+
+	let extraDistance = useMemo(() => {
+		if (myPlaceDetails != null && !(latitude === null || longitude === null)) {
+			const myLatitude = myPlaceDetails.latitude;
+			const myLongitude = myPlaceDetails.longitude;
+			const meToThem = latlongdist(
+				latitude,
+				longitude,
+				locationLongitude,
+				locationLatitude,
+				R_miles
+			);
+			const themToLocation = latlongdist(
+				latitude,
+				longitude,
+				myLatitude,
+				myLongitude,
+				R_miles
+			);
+			const totalWithThem = meToThem + themToLocation;
+			const totalWithoutThem = latlongdist(
+				locationLongitude,
+				locationLatitude,
+				myLatitude,
+				myLongitude,
+				R_miles
+			);
+			return totalWithThem - totalWithoutThem;
+		} else {
+			return null;
+		}
+	}, [
+		latitude,
+		longitude,
+		locationLatitude,
+		locationLongitude,
+		myPlaceDetails,
+	]);
+
+	const isTentativelyInvited = useMemo(
+		() => tentativeInvites.has(signup.user.id),
+		[signup.user.id, tentativeInvites]
+	);
+
+	if (user.id === me?.id) {
+		return null;
+	}
+
+	return (
+		<div
+			style={{
+				display: 'flex',
+				alignItems: 'center',
+				justifyContent: 'space-between',
+				position: 'relative',
+				padding: '1rem',
+				borderRadius: '0.5rem',
+				border: '1px solid #e0e0e0',
+				marginTop: '0.5rem',
+				marginBottom: '0.5rem',
+			}}
+			key={user.id}
+		>
+			<b>{user.name}</b>
+			{extraDistance ? `: +${extraDistance.toFixed(1)} miles` : ''}
+
+			{!hasCarpool &&
+				(isTentativelyInvited ? (
+					<CancelIcon
+						onClick={() => removeTentativeInvite(user.id)}
+						style={{ cursor: 'pointer' }}
+					/>
+				) : (
+					<PersonAddIcon
+						onClick={() => addTentativeInvite(user.id)}
+						style={{ cursor: 'pointer' }}
+					/>
+				))}
+		</div>
+	);
+}
 
 export default function EventSignups({
-	event,
 	signups,
 	myPlaceId,
 }: {
-	event: IEvent;
 	signups: IEventSignup[];
 	myPlaceId: string | null;
 }) {
+	const { event } = useContext(EventContext);
 	const carpools = event.carpools;
-	const placeDetails = usePlace(myPlaceId);
-	const locationLongitude = event.latitude;
-	const locationLatitude = event.longitude;
-	const me = useMe();
+	const myPlaceDetails = usePlace(myPlaceId);
 
 	const signupsWithoutCarpool = useMemo(() => {
 		// A list of users not in any carpool
@@ -31,67 +131,15 @@ export default function EventSignups({
 	return (
 		<div style={{ display: 'flex', flexDirection: 'column' }}>
 			<h3 style={{ marginBlockEnd: '0' }}>People without a carpool</h3>
-			{signupsWithoutCarpool.map(({ latitude, longitude, user }) => {
-				if (user.id === me?.id) {
-					return null;
-				}
-				let extraDistance = null;
-				if (
-					placeDetails != null &&
-					!(latitude === null || longitude === null)
-				) {
-					const myLatitude = placeDetails.latitude;
-					const myLongitude = placeDetails.longitude;
-					const meToThem = latlongdist(
-						latitude,
-						longitude,
-						locationLongitude,
-						locationLatitude,
-						R_miles
-					);
-					const themToLocation = latlongdist(
-						latitude,
-						longitude,
-						myLatitude,
-						myLongitude,
-						R_miles
-					);
-					const totalWithThem = meToThem + themToLocation;
-					const totalWithoutThem = latlongdist(
-						locationLongitude,
-						locationLatitude,
-						myLatitude,
-						myLongitude,
-						R_miles
-					);
-					extraDistance = totalWithThem - totalWithoutThem;
-				}
-
-				return (
-					<div
-						style={{
-							display: 'flex',
-							alignItems: 'center',
-							justifyContent: 'space-between',
-							position: 'relative',
-							padding: '1rem',
-							borderRadius: '0.5rem',
-							border: '1px solid #e0e0e0',
-							marginTop: '0.5rem',
-							marginBottom: '0.5rem',
-						}}
-						key={user.id}
-					>
-						<b>{user.name}</b>
-						{extraDistance ? `: +${extraDistance.toFixed(1)} miles` : ''}
-						<PersonAddIcon
-							onClick={() => {
-								// Invite to carpool and create carpool
-							}}
-						/>
-					</div>
-				);
-			})}
+			{signupsWithoutCarpool.map((signup) => (
+				<EventSignup
+					key={signup.user.id}
+					signup={signup}
+					myPlaceDetails={myPlaceDetails}
+					locationLatitude={event.latitude}
+					locationLongitude={event.longitude}
+				/>
+			))}
 		</div>
 	);
 }