I have been to Laguna for the past 4 years.
We camp at Archery Campsite which is on the Laguna Seca grounds.
We have a band playing Thursday/Fri/Sat evenings from around 730 until 11pm, that's when the Police comes and shuts the band down because of noise curfew, but the party keeps going.
There were about 300 people partying around the band on Saturday late.
Check out my home made clips, about 10 clips total of the band/party
These guys only play together on the GP weekend as they all come from different places.
Archery campsite is the place to camp.