Hi Sam, and congratulations of Sigma Kappa!
Nationally, Delta Zeta has no traditions involving "creepy faces" or the phrase "Delta Sweets". However, most chapters have their own traditions so those things could be pertaining to Beta Iota activities. They've been inactive for quite some time; I'm surprised things like that are still hanging around.
Watch out for the basement, though. That's where we keep the turtle bones and shells (j/k