If you wish to invite people who are not members of your group to an event, without adding them as members, you can do this.
Go to the event, press 'Invite' and select 'Contact or email/phone number'.
When you add their details they will receive an event invite and can accept this.
This can be a useful feature. For example, when you want to invite supporters to attend.
Find Out More
How to set up an event in Spond (Coming soon)