Well before the 1st race have a play on the bike and play with tyre pressures, generally as low as you dare without risking pinch flats. Practice figure of 8 turns & getting them smooth.
Practice getting on & off the bike, doesn’t have to be fast just reliable.
On the day get there early, get some sighting laps in looking for things that might cause a pinch flat do this at or near to race pace.
Warm up.
After 10 mins ignore the voices in your head telling you you’ll never finish, you’re not quick enough, feign a mechanical etc. Most others are having the same thoughts.
When the weather turns take a large towel & big Ikea bag for dumping wet & muddy kit into in car parks.
Enjoy it, if you are at all competitive you’ll soon find yourself racing against the same people each week trying to get one over each other.
Get a tap & hosepipe set up at home for washing down the bike when you get back.
Drag along kids and get them racing / spectating, very family friendly environment.
If you are doing the Yorkshire series and come to the 1st one on the 8th September at Bishop Burton, I’m organiser come and find me and I’ll buy you a brew.