This is a learn-and-play format, meaning you don't need to show up knowing the difference between a pung and a chow. The mixer component means there's a social layer beyond the game — expect people who want to talk as much as they want to play. Union Square's plaza has been hosting more community programming lately, and an outdoor mahjong session is the kind of low-friction afternoon that works if you've got an hour or three to burn mid-city.

Practical note: the plaza has limited seating and no shade cover, so a light layer and sunscreen are worth the five seconds. Bring your own water. If you want coffee first, Blue Bottle on Mint Street is a short walk and moves fast.

If you've only got two hours: show up, grab a seat at a table, ask to be taught. The game moves quickly once it clicks.