This is probably more of a weekend-event. Rather than time holes, suggested before, that act like mini-gates to different times where people/creatures can cross through, what about time waves. Basically, over a weekend, time waves crash over the island and everyone suddenly thinks it's 1960 or 1872 or 1776 don't mind me I think I'm hilarious.

So, say, at noon EST, it's suddenly Regency England and everyone is wearing gloves and talking like they're extras in Pride & Prejudice. Then, at five, it's 2015--but Back to the Future style. And at ten, we tumble back to Flintstone-esque prehistoric days, where there are humans and dinosaurs living together and every appliance is some random animal pressed into service. (Okay, actually, a Flintstone day/weekend by itself would be cool.)

Alternately, if switching every few hours seems like it would be too hectic, we could make this a non-BDE weeklong event, with the times changing every 8-12 hours or so. Because didn't you always want to go to school like Anne of Green Gables and write on chalkboards, with boys winning 'Best Arithmatic' awards while girls could win 'Best Handwriting'? (No, that never REALLY BOTHERED ME as a kid, why would you ask?) Or class Greek-symposium style, where someone just stands and talks and students gather to listen and occasionally someone else walks by and starts arguing.