Waterproof outer mahjong caseTexas‑south‑west‑border‑city‑multicultural‑festival‑organizers‑in‑El‑Paso‑regularly‑add‑mahjong‑demonstration‑booths‑to‑their‑large‑public‑event‑line‑ups‑to‑introduce‑local‑festival‑attendees‑to‑the‑rules‑history‑and‑cultural‑significance‑of‑this‑world‑renowned‑ancient‑tile‑based‑table‑game‑recreation‑activity‑form.