One of the seven wonders of the world can be found in China. So, of course, the one time I visited it was when there was a music festival. For six years, The Mansion Project of Shanghai would run the Yin Yang Festival on the Great Wall in Tianjin.
There are many local traditions around the holidays that you will only know if you are local. One such tradition for locals living near Bolton, England is to walk up Rivington Pike on Boxing Day.