B2B mahjong game supplyOakland‑based immigrant‑community‑associations host large‑annual‑mahjong‑get‑togethers that draw‑player‑visitors‑traveling‑in‑from‑many‑neighboring‑bay‑area‑cities for full‑day‑long tile‑game‑competition‑and‑social‑celebration‑activities.