Hello @OpenArmsK ,
The current event system uses an older email builder system, so there may be some significant differences between it and the regular email builder. Once you've built your event invite, saved and previewed/test sent it, and hit the golden Save/Continue button, you'll be able to select your list(s) and schedule the invite. Check out this article for a full rundown of constructing and sending event invites.
See also:
Event overview and getting started
Design tips for your event invitations
Event landing page vs invitation
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