Hi Stephen,
Thanks so much for reaching out and for your interest in our products!
With Eventbrite Tickets, at this time you can only connect one Eventbrite account / setup one Eventbrite API key. However you can enter any Eventbrite event’s ID to import it that way, which will allow you to import all of the events that you want.
Similarly, with Event Aggregator, you can also only connect to one Meetup.com account, but you can import any URL that you’d like.
I hope this helps to answer your question. Please let me know if you need any further clarification!
Thanks,
Jaime