Yeah, been to a number of
Meguiar’s events. Just had my car club’s detailing day yesterday. I’ve met some great people and made lots of friends (like
SpoiledMan 
) at Meguiar’s events. I highly recommend them.
The Saturday classes are scheduled for car clubs but if the guest club doesn’t fill the class (by like, the Monday before) anybody who joins MOL can sign up. Just keep an eye on whatever day you’d like to go. More often than not, there’s enough space to squeeze in.
The Wednesday night sessions are freeform so anybody on MOL can sign up. Unfortunately they’re only going to have a couple more this season. It’s starting to get dark early so after that we have to wait till spring for more Wednesday sessions.
As for vendors, I buy towels and tools all over the place (including ADS) but I buy most of my chemicals locally (well, I buy chemicals from ADS too). Even with Ca tax local online vendors can be plenty competitive.
Excel Detail’s great.
PC.