"They are providing toilets, a stand for a band, speakers, mic's, food stalls and more."
Just a thought regarding depending on others. If you can provide backups for some things, such as microphones in case the ones provided fail, or aren't provided as promised, certain routes to failure will be blocked redundantly, which I have found to sometimes be critical to success by not providing redundancy and failing at doing things in the past.
I hope the event is a great success.
Thanks!