Hello
I went to the Chevron 7.2 event and parking wasn't good. If you're a resident you'll probably be fighting for a space at the rear car park. I think there were approx 70 spaces.
If you're not actually staying at the Park Inn, my recommendation is get a taxi! Or if you're staying at the Swan Hotel, Embankment or the Shakespeare, park at your own hotel and walk because literally, all these hotels are about 2 - 5 mins walk.
There is a very small car park to side of the hotel which is a pay and display but maximum time is 2 hours and I saw a couple of cars getting caught out with this ending up with fines. This car park is however FREE on Sundays so if you're staying a bit further out of town, get taxis on the Saturday (easy excuse to drink beer through the day!) and on the Sunday if you get there early enough you'll be able to park in this small car park for FREE and all day.
I hope this helps, if anyone has any questions about the venue and stuff, please feel free to ask!
Bacardiguzzler