Ok so I am involved in our PTA. Started as treasurer as no one else would, am now co-chair. I've lived through skeleton crew years where we cancelled events (notably, the summer and Christmas fairs) because we simply couldn't get people to sign up/ show any interest in helping. Everyone wondered why there was no fair, and all the three of us could say was "three people and their families can't staff a fair." We now have a few more people involved, thankfully, and we're able to properly have a normal calendar of events which the children love. Nothing excessive: Christmas fair, one disco per term, summer fair, one quiz night for parents.
What is frustrating is to hear from parents when you finally decide not to hold an event due to lack of volunteers, all of a sudden everyone says they could have done it. Well, if you ignore all the bookbag begging, and the FB page asking politely, what else are we going to do? Everyone wants to have events at the school but no one wants to help make it happen. I absolutely appreciate that you'd rather spend 100% of that time with your family but if everyone felt that way, well, etc. We're never going to be a group that "stands out with a clipboard getting people to sign up" (a comment I'm seeing a lot here!) but I bet those schools actually manage to run some decent events!
Now that I've said all that
there are PTAs out there with some very cliquey people in them, they seem to join as a pre-made group and it's very much a popularity contest. I'm fortunate that our school doesn't have much of that, so most of my impressions of volunteering have been positive. I've made some good friends and I'm not a school gate mum at ALL so this has been my main source for info and interaction with other parents.
If you're still reading and actually want to help the PTA, I suggest just signing up to help at an event to start. You can avoid the pressure you might feel at a meeting, and you can get a feel for how the committee treats people. If you like the look of things, offer to help more. If not, then don't. Maybe try again next year, because turnover is definitely a thing due to children moving on or volunteers leaving.
If you have absolutely no time or interest: donate a bottle or two to the tombola requests.