Hi Nico!
Thanks for getting in touch and for your interest in our Community Manager bundle.
Let me answer each of your questions:
How do organizers get assigned? I am looking to have only an specific membership level be able to set up new events.
Organizers for an event are assigned when creating or editing the event. You can learn more about them here > https://theeventscalendar.com/knowledgebase/venue-and-organizer-pages/
On the other hand, if you want to only allow a specific WordPress user role to be able to create events, then you can do so in the community settings > https://theeventscalendar.com/knowledgebase/community-events-settings/#access-control
Do I have 100 % control of the payments being made?
Payments are all handled by the ecommerce plugin you choose to use (EDD or WooCommerce). If you choose to use WooCommerce, then let me share the following documentation with you so you can get a sense of the different roles and capabilities > https://docs.woocommerce.com/document/roles-capabilities/
I hope that helps. Let me know if any follow up questions.
Best,
Victor