I can only recall a few and they may have changed since i've left....

AChiO--
ADPi--Playdays--(kickball tourney)
APhi--Ivy Cup Fraternity Volleyball Challenge
ChiO--
Tri-Delt--Triple Play (softball tourney)
Delta Gamma--Anchor Spalsh
Theta--
KD--See-Saw-A-Thon
Kappa--
Pi Phi--
Zeta--Crown Classic (golf torney)

KA/Phi Delt--Kalf Fry (concert)
Beta--Beta 500 (go cart race)
Farmhouse--Smart Girls (trivial game..i think...)
Kappa Sig--
Delta Sig--Miss Fall Rush
Fiji--Fiji Olympics
SAE--Chili Cook-off
Sigma Chi--Derby Days
TKE--Crawfish Festival
Pike--Pikefest (concert)

can't remember the rest.......