I would put an explanation on the invite. That way there is no question. But you still may have less attend depending on how they feel about it. I know I wouldn’t show up myself. I’m immunocompromised also and haven’t had the shots and haven’t had Covid. Been out and about since before Alot of others. I believe I got my RA from a mandatory flu shot. So I have my on feelings about the vaccines and the test. Personal choice.