Forum Moderators: martinibuster
I have a travel site, so I tend to see the biggest drops in traffic or revenues when people are on vacation (since, when they're on vacation, they're unlikely to be planning the next vacation).
Also, a lot of my audience lives in Europe, so European holidays often affect me more than U.S. holidays do (in part because many Europeans get more vacation time than Americans do, which means they're more likely to be away from home over holiday weekends).