Way back in the olden days (okay, late 80's), we had spring pledges and we were on quarters. Our pledges were initiated right away in the fall as soon as rush was over. They did not wait to initiate with the fall pledges. They participated in every aspect of rush, but could not vote on membership IIRC.
Things may be different now, but that is the way it was back in the good old days of big frill rush!
__________________ "Let us found a society that shall be kind alike to all and think more of a girl's inner self and character than of her personal appearance." Sarah Ida Shaw