Google Chat will automatically suggest chats based on your Google Calendar

In Google Chat, you will now see suggested chats based on your current meetings on your Google Calendar. You’ll see the suggested conversation shortcut at the top of the Chat section in Gmail on mobile and web and in Google Chat on mobile. Suggested chats will appear at the top of the Chat section in Gmail. 

The suggested conversation shortcut will be visible 10 minutes prior and 10 minutes after the meeting ends. This feature should make it easier to share information and files before a meeting begins, let meeting attendees know you’re running late, or share quick follow-ups once a meeting has concluded.