Blossom Music Center for Dummies?

I’m going to a concert at Blossom in a little over a week, and I’m super nervous about not knowing how the venue works. Is there food/drink available? Where can I rent a chair? When it says you can only bring bags of a certain size, is it one bag per person, or could you bring two if they’re the required size? Any advice for avoiding mosquitoes/heatstroke for lawn seats? All that fun stuff.

I know it’s dumb, but I’m autistic and socially awkward as hell, and this is something I’m doing to help take a step out of my comfort zone. I overthink these things way too much, so I was hoping I could get some outside advice. Thanks in advance!