Same as today will attract biggest number, yes there is always that story it benefits the most the europeans, but in reality thats the biggest player base, you can do morning ones on like saturday or sunday(like 10-12 server time) but still wont be even close as prime time show ups. About rewards you cant really do anything special but fireworks and maybe instead of a bad chest with a random item, give ratatoutile(close enough) or stuff like that, that is still usable, since 90% of UPS shop is a bit, old. Also it really isnt hard to raise number of players allowed on each side, turning awesomia from 130 vs 120, to 200 vs 200 to make sure everyone gets in would be very nice.