I’ve been on the Board of a non-profit for three years now. You’re not expecting too much to have all pertinent materials sent out at least a day ahead. You need time to review them so you can talk sensibly about the issues.
I know all of us on my board are expected to donate every year and raise money if possible. So I probably wouldn’t have an issue with a volunteer calling me. I give what I can. Some years it’s not much!
We had an explosive newspaper article come out about our Executive Director in 2020. We’ve spent the past year dealing with all of that. We ended up letting her go (well, she resigned when the writing was on the wall) and getting an interim Director who has been fabulous. She has really helped whip the organization into shape but she stays positive the whole time! I really hope she stays on.
Good luck - it’s not easy!