The platform is the same underneath. What changes is which parts you lean on, and which subscriptions you get to cancel. Pick the one that sounds like you.
The painful part of running an association is not the events — it is that the member list lives in one system and the ticket sales live in another. On Addmi a renewal and a ticket discount are the same record, so member pricing is simply correct.

There is no monthly fee, so running Addmi alongside your current platform for a season costs you nothing. Most organizations move one event, then stop renewing the old contract.
Pick the next event on the calendar and build it here. Your current platform keeps running everything already on sale.
Import members and past attendees, add whatever custom fields your organization actually tracks, and keep the history.
Once a season has run here, the old subscription has nothing left to do. Nothing to cancel on this side — there was never a contract.
Associations to arenas — if you run events, Addmi fits.
Because they use everything you have already built:
Moving over, bringing your list, and getting the first event live.
Yes, and you do not have to move everything at once. Most organizations run their next event on Addmi while the old system finishes what is already on sale. With no monthly fee, overlapping for a season costs nothing.
Create your event, sell every ticket, and run every on-site sale from one platform.
You handle the event. Addmi handles the technology.