Diamond Supply once again delivered a session to remember on Go Skateboarding Day, this time at their freshly-poured Diamond Plaza in Los Angeles. The action-packed best trick contest kicked things off, and it featured some eye-opening flip trick variations that you'll probably struggle to wrap your head around at first glance. The day also featured a massive game of skate, a tech ledge contest, and a bunch of other classic GSD goodness. This video sums it all up nicely for your viewing pleasure.