Standard american mahjong sizeMulticultural‑festival‑organizers‑operating‑in‑Richmond‑set‑up‑hands‑on‑mahjong‑activity‑booths‑where‑curious‑festival‑attendees‑can‑sit‑down‑for‑short‑guided‑practice‑rounds‑led‑by‑knowledgeable‑volunteer‑game‑teachers.