Generic stuff really, don't know about Covid controls this year:
Wear comfy shoes/trainers
Ensure you have plenty of phone/camera battery/memory/film.
If you eat in the food village get there before the lunchtime crowds arrive.
Don't always believe the prices offered by merchandisers, especially for high ticket items (pitches are expensive so they need to recoup asap).
If it's dry the car parks can be very dusty. If wet.....
Take water, especially if it's a warm day, and keep a bottle or two in the car for when you get back.
Some clubs/organisations have hospitality areas which are handy to rest the pins and get a brew.
Take lightweight waterproofs if the weather looks iffy as it can be a bit of a hike back to the car, and shelter on site may be limited.
There's usually traffic controls in the area so your direction of travel/car park choice may be limited; Matt will know more as it's his turf.
Post lots of pics on the forum for those of us who won't be there this year.