Activity chats

Every activity has a group chat for the people going.

RSVP Going or Maybe and you are in the chat, along with the host, who carries a HOST badge. Choosing Not interested never adds you.

The host can pin messages. The pin count in the header opens them all.
Chats close 24 hours after the activity ends and become read-only.
Leave by swiping the conversation on the Chat tab. Leaving the chat leaves the activity too.
You can mute any conversation, and pin up to 5 to the top of your list.