I only find one casino that launched promotion about Bitcoin Pizza Day.
Although based on history, Bitcoin Pizza Day didn't trigger Bitcoin price to rise, but there's a possibility to reach $70K since the price right now hovering around $67K.
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Casino usually launch a special promotion dedicated for this event.
Can you mention what are the promotions in the past that launched by casinos, IIRC there was no something special. Mostly it's centralized exchanges that launch promotions dedicated for Bitcoin Pizza Day.
I don’t know if this is what you’re looking for, but BCGAME just launched some contests - Free Raffle[1] and Pizza making contest[1], under the management of icopress to celebrate Bitcoin Pizza day with the community.
It's more like an annual event by Bitcointalk instead of Bc.game, in this event they're the sponsorship, not the one who have an idea to start the event.