The real question: Is this the Bar? We do not know it for sure. It is a bar! There are many bars and venues in most beach areas. Most share the parking lots. So, this may not be the bar just L&P messing with us for a laugh.
Now, that being said, Is this a real biker bar? If it is, as has been pointed out, they don't back their bikes in. This is not hinting at a hard core biker establishment. Not the Hell's Angels, Diablos, Bandidos, or Nomads, etc, etc... . So could it be a biker bar for all the rich people who like to get the 40k Harley, a couple of stylish Tats, and then go to a bar with their friends and act like bikers while sipping chardonnay or Glenfiddich. These places do exist and Sam and his band could get in there by contacts or just reasonable skill. Now in this case the event would be as many previously theorized. It is not a fight club on steroids it is just a place for the wanna bees to rub elbows with other wanna bees.
If it is a real biker bar. Sam will know exactly where his guitar is. Walking may be an issue but he will have his guitar. The rest of his band, meh! Patricia will be busy backing her and Sophia out before they become the dessert for the patrons. This would be bad juju. So not likely L&P will take this path.
Ergo, I see two options: One; He is having a good laugh messing with us as this is just another bar in the area. Two; This is not a real biker bar but a bar where middle and upper class people come to share their love of motorcycles and play act a bit.
If I am wrong, and he is trying a real biker bar, he is definitely a few fries short of a happy meal. Just Sayin'!