[aephi alum]

I'm not a Tri Sigma, nor did I attend a commuter school, so bear that in mind.

My chapter encouraged participation in non-mandatory events and required participation in mandatory events via a point system. For instance, you got points for going to mixers and sisterhood events, and lost points for each day of work week and recruitment that you missed (barring a valid excuse like illness or religious obligations). You lost mega points for missing initiation. If you didn't accumulate enough points, you lost privileges (like not being allowed to go to formal) and/or incurred fines.

And you require outfits by telling the sisters well in advance, "We are wearing red t-shirts, blue jeans, and boots for round 1, white blouses, black skirts, and pumps for round 2, and black dresses and heels and your badge for pref. If you don't own these clothing items or shoes, BUY THEM." Then you do dress checks, and tell sisters who have (let's say) too short a skirt for round 2 to go buy (or borrow) a longer skirt. The required items should be items that can be re-worn - who doesn't need a nice black dress or a pair of jeans? If a sister turns up to recruitment wearing the wrong outfit, send her off to change clothes, or keep her off the floor and make sure she loses points for missing a day of rush. You may come off as a b*tch, but think about how weird it'll look when PNMs arrive and see 99 women in red t-shirts and one in hot pink.

Good luck to your chapter on your upcoming recruitment!