SANTA ROSA — Amid the euphoria of this weekend’s famed Emerald Cup weed fest, there was this creeping buzzkill: the glacial rollout of legalization.

Right when it seems like “The Great Pot Moment” is upon us, it turns out there are a lot of really tough regulatory issues to resolve first, according to government and industry experts who sketched out all the thorny challenges at the two-day conference, competition and harvest celebration at the Sonoma County Fairgrounds.