We have a briefing for first timers at 9am ( we start at 930)
Defo turn up early , half an hour before it starts. That's 830 if you are in England . You need time to warm up etc. the run webpage will tell you if there are loos and when they open ( ours don't open until 10 sadly )
Go up and say hi to a person in a hi vis vest with Parkrun on the back. Failing that, look for someone with a friendly face wearing a red 50 t shirt or black 100 t shirt.
You don't HAVE to speak to anyone, but you will have more fun.
If you start near the back you can have fun passing people after 20 mins.
Whatever you do Don't run fast. If you get slightly faster each week , you can always get a PB. Again, this isn't compulsory but is more fun . And you get to brag to your friends and family, as well as here on this thread .