On the event day, if you want to make an important announcement for all the active attendees in your booth chatroom, then you can use the sticky note option.
The sticky note option is available only in a group chat, and not in a direct/private chat. Using this option, you can pin a text message at the top of the chat room.
Note: Being a booth rep, you can post only one sticky note at a time in your chatroom. To remove a previously posted sticky note, click on the sticky note icon again, and click on the Delete option. You can also edit the existing sticky note that is already posted in your chatroom.