Send a note to guests in Apple Invites
After you create an event and invite guests, you can post a note that everyone on the guest list can see. For example, you can let guests know if you changed the location, or remind them to bring umbrellas if it’s going to rain.
Send a note to guests in the app
- Go to the Apple Invites app - on your iPhone. 
- Tap an event, then tap Send a Note. 
- Write a note, then tap Send Note. 
Send a note to guests on iCloud.com
- Go to icloud.com/invites, then sign in to your Apple Account (if you haven’t already). 
- Select an event. 
- In the host tile, select - next to your name, then select “Send an update.” 
- Write a note, then select - to send it. 
For more details about Apple Invites and what you can do with it, see Introduction to Apple Invites.