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.
10,000 BTC? If only we could see the future. I certainly would have killed to buy a handful of Bitcoin when it was well under $100. But, thank you for the informational on which day was the day the first item was bought with Bitcoin!