This is what happens when a game is played world wide. No matter what time they'd take the game down for maintenance/patching/whatever players somewhere in the world will be affected. The time they pick, 0930 their time, is at the start of their workday. It sucks for those affected but, if it wasn't you, it'd be someone else.
Also 420 is not an official holiday here in the US. It's just an excuse for those who partake of the "Devil's Weed" (J/K) to smoke in public, though with Corona going around, San Francisco blocked off Hippy Hill in Golden Gate Park to prevent people who gather there annually on 04-20 to smoke.