Add contacts from another project to an event as guests
You can add contacts from another project to an event as guests
How it works
This option must first be turned on for the project that is hosting the event
Click the Add/Remove Guests button as usual
The Known Contacts list will still only list the contacts who are in the project that is hosting the event
But when you start to search for contacts, you will see contacts who are not in that project
You can add them to the event as a guest
This will also automatically add them to the project that is hosting the event