PTA chair here about to go into my third year as chair and before that vice chair for a year, I haven't read the post but we are successful and have loads of positive feedback at our events. My advice would be:
Good relationship with the head teacher and teachers they help us run our events. They also speak to me about what their kids schools ptas are doing and we steal ideas 😂.
Good relationship with office staff as you'll need them for comms and any online payments you need setting up.
Get to know the kids, we are a small village school of 130 kids, so that is probably easier for me but whenever I am in school the kids know me and I know them, it helps that the parents see that I'm friendly to the kids.
Let parents know what you're raising funds for and why
If its your first time running a certain event make it clear so parents can expect mistakes to be made
Respect the fact that turning up and spending money is just as helpful and the volunteers running the event
Understand why you are able to plan and run the event and not others and don't hassle the parents who can't help.
Make it clear that you can help all year or just one event. We have lots of parents who just help at the Christmas fayre and not throughout the year.
And the most important one I would say is focus on the kids enjoyment of the events you do, if the kids are enjoying it the parents are more likely to chill.
There are lots of Facebook groups for ideas. Look up PTA parentkind. You will need insurance for your events.
Happy to help if you have any questions.