there is Bitcoin Pizza Day which is celebrated on May 22. as you now Laszlo Hanyecz bought two pizzas for 10 000 BTC and this fact made bitcoin famous. I think this purchase made very much for promoting bitcoin.
I think i like this celebration of pizza rather than 'International Bitcoin's Day' IMO because he's too famous now for buying a two pizzas for 10,000 BTC, must have been a huge money if it were invested today. He's too famous on this forum because of that and people might wanna remember his name for his generous act of buying. 