I’m on my phone so I can’t really type up a huge review of the series, but I can say this: be glad you’re going this year. This is the last time the ALMS will race in its current, and definitely better form. Next year, they merge with Grand Am, and P1 will cease to exist, so this year is the last year we will see really fast cars.
For Laguna, don’t expect Audi to show, they usually don’t do anything other than Sebring and PLM. That being said, P1 will be represented by Pickett Muscle Milk racing, Dyson racing, and Rebellion racing, which should make it pretty interesting. Still,in Laguna Seca, the star of the show is almost always GT, and I strongly suggest following GT, since that has the largest entry list, and usually the best racing.
Have fun! ALMS is always great, I’ve been going to The 12 hours for the past 5 years now, and will definitely go for the next few years, even if it’s just for the atmosphere of the track and paddock.