Select the event you are hosting.
Click on the airplane icon under your name (3rd icon from the left).
Invite Guests
Select invite guests.
There are 3 ways you can add to your invite list:
Enter emails or phone numbers
Add all guests from a community member list.
Add all guests from previous events.
Once all your guests are added hit send to invite everyone to your event!
If you have a maximum guest limit set for your event be mindful of the number of people you are inviting.