Yeah, I'm looking forward to Canada Day. I even made sure to get the day off... I wanna go to the harbour wearing shorts so I can show off my maple leaf tattoo.
Now, to answer the other question...
Absolutely. In a D&D campaign I ran about a year ago (that sort of fizzled due to another GM taking over), there was a "festival of candles" that the PCs got involved in. It was a pretty interesting holiday - everyone bought a special candle from the church, and were religiously obligated to light their houses with these candles. These candles were made to burn for a long period of time, and there was something of a local competition - who could make their candles burn the longest? The holiday lasted three days, with the days composing of the local priests telling various stories relating to their goddess (a hearth goddess who was once mortal, dying protecting children from wolves) - during the nights, the locals would cloister themselves inside their homes, since it was a time for families to gather and for people to enjoy the benefits of home. There was also visiting between families, and a bit of small gift-giving.
I ran the adventure with the PCs trying to figure out who killed their employer (a higher level abjurer who hunted renegade wizards) while at the same time evading ghouls from "the City of the Flesh-Eaters" a few days' ride away. It was a really cool adventure, because the group had to work around the rules set out by the holiday.