Sounds like a great idea. However, game modes should be separated to keep things equal due to some game modes having boosted drop rates. If they're not separated, the wins are nearly guaranteed to go to classic players that already have stellar gear to get quick kills. Also, GWD2 bosses (including Telos unless you restrict it to starting at a low enrage) should be excluded too since players that have already done a lot of PVM will have an advantage there with the boosted rates. Other than those two things, this sounds like a good event idea.