diff --git a/src/components/Event/Event.tsx b/src/components/Event/Event.tsx
index 9b6092e..98703ad 100644
--- a/src/components/Event/Event.tsx
+++ b/src/components/Event/Event.tsx
@@ -1,10 +1,11 @@
 import { useCallback, useEffect, useRef, useState } from 'react';
+import { green, lightgrey } from '../../lib/colors';
 import {
 	addOrUpdateEventSignup,
+	getEvent,
 	getEventSignups,
 	removeEventSignup,
 } from '../api';
-import { green, lightgrey } from '../../lib/colors';
 import { useMe } from '../hooks';
 import { IEvent, IEventSignup } from '../types';
 import UIButton from '../UI/UIButton';
@@ -14,6 +15,7 @@ import UISecondaryBox from '../UI/UISecondaryBox';
 import UISecondaryHeader from '../UI/UISecondaryHeader';
 import useThrottle from '../useThrottle';
 import EventCarpools from './EventCarpools';
+import EventContext from './EventContext';
 import EventDetails from './EventDetails';
 import EventSignups from './EventSignups';
 
@@ -21,8 +23,14 @@ function GroupName({ group }: { group: IEvent['group'] }) {
 	return <UILink href={`/groups/${group.id}`}>{group.name}</UILink>;
 }
 
-export default function Event({ event }: { event: IEvent }) {
-	const { name, group, formattedAddress, startTime, endTime } = event;
+export default function Event({
+	id,
+	initial,
+}: {
+	id: number;
+	initial?: IEvent;
+}) {
+	const [event, setEvent] = useState<IEvent | null>(initial || null);
 	const [placeId, setPlaceId] = useState<string | null>(null);
 	const [interested, setInterested] = useState(false);
 	const [updating, setUpdating] = useState(false);
@@ -36,6 +44,12 @@ export default function Event({ event }: { event: IEvent }) {
 	});
 	const me = useMe();
 
+	const refresh = useCallback(() => {
+		getEvent(id).then(setEvent);
+	}, [id]);
+
+	useEffect(refresh, [refresh]);
+
 	useEffect(() => {
 		if (signups === null) {
 			return;
@@ -43,7 +57,7 @@ export default function Event({ event }: { event: IEvent }) {
 
 		const removeSignup = () => {
 			if (prev.interested) {
-				removeEventSignup(event.id)
+				removeEventSignup(id)
 					.then(() => {
 						prev.interested = false;
 					})
@@ -56,13 +70,13 @@ export default function Event({ event }: { event: IEvent }) {
 				console.log('Adding or updating signup.', prev, {
 					interested,
 					placeId,
-					eventId: event.id,
+					eventId: id,
 					signups,
 				});
-				addOrUpdateEventSignup(event.id, placeId)
+				addOrUpdateEventSignup(id, placeId)
 					.then(() => {
 						prev.placeId = placeId;
-						prev.eventId = event.id;
+						prev.eventId = id;
 						prev.interested = true;
 					})
 					.finally(() => setUpdating(false));
@@ -76,16 +90,16 @@ export default function Event({ event }: { event: IEvent }) {
 		} else {
 			addOrUpdateSignup();
 		}
-	}, [event.id, interested, placeId, signups, updating]);
+	}, [id, interested, placeId, signups, updating]);
 
 	useEffect(() => {
-		getEventSignups(event.id)
+		getEventSignups(id)
 			.then((signups) => {
 				for (let signup of signups) {
 					if (signup.user.id === me?.id) {
 						setInterested(true);
 						setPlaceId(signup.placeId);
-						existingSignup.current.eventId = event.id;
+						existingSignup.current.eventId = id;
 						existingSignup.current.placeId = signup.placeId;
 						existingSignup.current.interested = true;
 					}
@@ -93,42 +107,54 @@ export default function Event({ event }: { event: IEvent }) {
 				setSignups(signups);
 			})
 			.catch(console.error);
-	}, [event.id, me?.id]);
+	}, [id, me?.id]);
+
+	if (!event) {
+		return <UISecondaryBox>Loading...</UISecondaryBox>;
+	}
+
+	const { name, group, formattedAddress, startTime, endTime } = event;
 
 	return (
-		<UISecondaryBox>
-			<div style={{ textAlign: 'center' }}>
-				<UISecondaryHeader>{name}</UISecondaryHeader>
-				<GroupName group={group} />
-			</div>
-			<EventDetails {...{ startTime, endTime, formattedAddress }} />
-			<UIButton
-				onClick={toggleInterestedThrottled}
-				style={{
-					backgroundColor: interested ? green : lightgrey,
-					color: interested ? 'white' : 'black',
-					transition: 'color 0.2s, background-color 0.2s',
-				}}
-			>
-				{interested ? 'Interested' : 'Not interested'}
-			</UIButton>
-			{interested && (
-				<>
-					<UIPlacesAutocomplete
-						placeholder="Pickup and dropoff location"
-						onSelected={(_address, placeID) => {
-							setPlaceId(placeID);
-						}}
-						style={placeId != null ? { border: '2px solid ' + green } : {}}
-						placeId={placeId}
-					/>
-					<br />
-					<EventCarpools event={event} />
-					{signups !== null && (
-						<EventSignups event={event} myPlaceId={placeId} signups={signups} />
-					)}
-				</>
-			)}
-		</UISecondaryBox>
+		<EventContext.Provider value={{ event, refresh, default: false }}>
+			<UISecondaryBox>
+				<div style={{ textAlign: 'center' }}>
+					<UISecondaryHeader>{name}</UISecondaryHeader>
+					<GroupName group={group} />
+				</div>
+				<EventDetails {...{ startTime, endTime, formattedAddress }} />
+				<UIButton
+					onClick={toggleInterestedThrottled}
+					style={{
+						backgroundColor: interested ? green : lightgrey,
+						color: interested ? 'white' : 'black',
+						transition: 'color 0.2s, background-color 0.2s',
+					}}
+				>
+					{interested ? 'Interested' : 'Not interested'}
+				</UIButton>
+				{interested && (
+					<>
+						<UIPlacesAutocomplete
+							placeholder="Pickup and dropoff location"
+							onSelected={(_address, placeID) => {
+								setPlaceId(placeID);
+							}}
+							style={placeId != null ? { border: '2px solid ' + green } : {}}
+							placeId={placeId}
+						/>
+						<br />
+						<EventCarpools />
+						{signups !== null && (
+							<EventSignups
+								event={event}
+								myPlaceId={placeId}
+								signups={signups}
+							/>
+						)}
+					</>
+				)}
+			</UISecondaryBox>
+		</EventContext.Provider>
 	);
 }
diff --git a/src/components/Event/EventCarpools.tsx b/src/components/Event/EventCarpools.tsx
index f4418d9..09d2068 100644
--- a/src/components/Event/EventCarpools.tsx
+++ b/src/components/Event/EventCarpools.tsx
@@ -1,15 +1,41 @@
-// import CallMergeIcon from '@material-ui/icons/CallMerge';
+import CancelIcon from '@material-ui/icons/Cancel';
+import CheckIcon from '@material-ui/icons/Check';
 import EmojiPeopleIcon from '@material-ui/icons/EmojiPeople';
-import { useCallback, useMemo, useState } from 'react';
+import { useCallback, useContext, useMemo, useState } from 'react';
 import { createCarpool } from '../api';
 import { lightgrey } from '../../lib/colors';
 import { useMe } from '../hooks';
 import { IEvent } from '../types';
 import UIButton from '../UI/UIButton';
 import UILink from '../UI/UILink';
+import EventContext from './EventContext';
+import {
+	useCancelCarpoolRequest,
+	useInvitationState,
+	useSendCarpoolRequest,
+} from '../../state/Notifications/NotificationsHooks';
 
-function CarpoolRow({ carpool }: { carpool: IEvent['carpools'][0] }) {
+function CarpoolRow({
+	carpool,
+	inCarpoolAlready,
+}: {
+	carpool: IEvent['carpools'][0];
+	inCarpoolAlready: boolean;
+}) {
 	const PADDING = '1rem';
+	const inviteState = useInvitationState(carpool.id);
+
+	const cancelCarpoolRequest = useCancelCarpoolRequest();
+	const sendCarpoolRequest = useSendCarpoolRequest();
+
+	const sendButton = useCallback(() => {
+		sendCarpoolRequest(carpool.id);
+	}, [sendCarpoolRequest, carpool.id]);
+
+	const cancelButton = useCallback(() => {
+		cancelCarpoolRequest(carpool.id);
+	}, [cancelCarpoolRequest, carpool.id]);
+
 	return (
 		<div
 			style={{
@@ -40,14 +66,32 @@ function CarpoolRow({ carpool }: { carpool: IEvent['carpools'][0] }) {
 					<b>{carpool.extraDistance} miles</b>
 				</div> */}
 			{/* </div> */}
-			<EmojiPeopleIcon style={{ fontSize: '2em' }} />
+			{!inCarpoolAlready && (
+				<>
+					{inviteState === 'none' ? (
+						<EmojiPeopleIcon
+							style={{ fontSize: '2em', cursor: 'pointer' }}
+							onClick={sendButton}
+						/>
+					) : inviteState === 'requested' ? (
+						<CancelIcon
+							style={{ fontSize: '2em', cursor: 'pointer' }}
+							onClick={cancelButton}
+						/>
+					) : (
+						// inviteState === 'invited
+						<CheckIcon style={{ fontSize: '2em', cursor: 'pointer' }} />
+					)}
+				</>
+			)}
 		</div>
 	);
 }
 
 type CreationStatus = null | 'pending' | 'completed' | 'errored';
 
-export default function Carpools({ event }: { event: IEvent }) {
+export default function Carpools() {
+	const { event } = useContext(EventContext);
 	const [creationStatus, setCreationStatus] = useState<CreationStatus>(null);
 	const [createdCarpoolId, setCreatedCarpoolId] = useState<null | number>(null);
 
@@ -59,7 +103,8 @@ export default function Carpools({ event }: { event: IEvent }) {
 			),
 		[event.carpools, me.id]
 	);
-	const alreadyInCarpool = myCarpool !== undefined;
+	const alreadyInCarpool =
+		myCarpool !== undefined || creationStatus === 'completed';
 
 	const createEmptyCarpool = useCallback(() => {
 		setCreationStatus('pending');
@@ -107,7 +152,11 @@ export default function Carpools({ event }: { event: IEvent }) {
 				</>
 			)}
 			{event.carpools.map((carpool) => (
-				<CarpoolRow carpool={carpool} key={carpool.id} />
+				<CarpoolRow
+					carpool={carpool}
+					key={carpool.id}
+					inCarpoolAlready={alreadyInCarpool}
+				/>
 			))}
 		</div>
 	);
diff --git a/src/components/Event/EventContext.tsx b/src/components/Event/EventContext.tsx
new file mode 100644
index 0000000..40633da
--- /dev/null
+++ b/src/components/Event/EventContext.tsx
@@ -0,0 +1,12 @@
+import { createContext } from 'react';
+import { IEvent } from '../types';
+
+const EventContext = createContext({
+	refresh: () => {
+		console.error('not implemented: refresh');
+	},
+	event: null! as IEvent,
+	default: true,
+});
+
+export default EventContext;
diff --git a/src/components/Event/EventPage.tsx b/src/components/Event/EventPage.tsx
index 2cd8865..42a4e04 100644
--- a/src/components/Event/EventPage.tsx
+++ b/src/components/Event/EventPage.tsx
@@ -16,7 +16,7 @@ export default function EventPage() {
 	return (
 		<>
 			<Header />
-			{event ? <Event event={event} /> : <span>Loading...</span>}
+			{event ? <Event id={id} /> : <span>Loading...</span>}
 		</>
 	);
 }
diff --git a/src/components/EventStream.tsx b/src/components/EventStream.tsx
index c394463..4f8b67a 100644
--- a/src/components/EventStream.tsx
+++ b/src/components/EventStream.tsx
@@ -5,7 +5,7 @@ export default function EventStream({ events }: { events: IEvent[] }) {
 	return (
 		<div style={{ display: 'flex', flexDirection: 'column', width: '100%' }}>
 			{events.map((event) => (
-				<Event event={event} key={event.name} />
+				<Event id={event.id} initial={event} key={event.name} />
 			))}
 		</div>
 	);
diff --git a/src/state/Notifications/NotificationsHooks.tsx b/src/state/Notifications/NotificationsHooks.tsx
index 5959238..dbb3f70 100644
--- a/src/state/Notifications/NotificationsHooks.tsx
+++ b/src/state/Notifications/NotificationsHooks.tsx
@@ -2,6 +2,14 @@ import { useMemo } from 'react';
 import { useContext } from 'react';
 import { NotificationsContext } from './NotificationsProvider';
 
+export function useSendCarpoolRequest() {
+	return useContext(NotificationsContext).sendCarpoolRequest;
+}
+
+export function useCancelCarpoolRequest() {
+	return useContext(NotificationsContext).cancelCarpoolRequest;
+}
+
 export function useInvitationState(
 	carpoolId: number
 ): 'invited' | 'requested' | 'none' {