Everything *says* no cancellations so that the presenter has no obligation to you if you can't come.
But presumably as a subscription/member-supported non-profit, if you call and say "I have covid and i can't come tonight" they're happy to have you donate the tickets back to them. They resell them to someone on the cancellation line and you get a donation receipt. If your printed tickets still then show up at the door, they won't work.
