It's worth keeping in mind how absolutely massive the Chinese diaspora communities are around the world. In many cases it's through these communities that things like Dragon Boat festival have made it into other parts of the world.

In the case of Dragon Boat racing in particular, this is in part the result of the sport, and as /u/Searocksandtrees suggested, you should check out /r/dragonboat.

However festivals more generally are growing in popularity as the result of having gained traction through various Chinese communities around the world and then getting the attention of non-Chinese residents. In places like Vancouver and Melbourne, Chinese New Year is a major event in the city drawing large numbers of attendees who might not otherwise have any connection to China or Chinese communities.

There's still a difference between attending Chinese New Year celebrations in Chinatown in your city and actually celebrating the festivals yourself if you're not otherwise Chinese in some way. English-Canadians aren't exactly shifting their calendars around to go sweep their ancestors graves in April, or making zongzi to throw in the Saint Lawrence River.

hi! This sub isn't always the deepest in sport historians, so it would be worth x-posting to the community itself: /r/dragonboat/. Athletes and particularly tournament organizers are often quite knowledgeable on local sport history, especially for a sport that's been introduced fairly recently.