[PenguinTrax]

1. After three sororities are picked to present to Panhellenic, is there a deadline where a sorority must "accept" to do so?
Only if the campus PHC sets a deadline

2. Follow up to number one. Are there any provisions that the sorority that was "next" in votes (4th), be invited to present if a sorority declines to accept.

again, that's up to the campus PHC

3. Is it possible for two sororities to withdraw and thus only one group presents? Or only two groups selected to present? Or even one selected to present? And if so, how would a single presenter be approved? For example, a simple majority voting "yea"?

I'd say anything is possible, although I'd hazard a guess that if all but 1 group declined, the PHC would revote to bring on at least one more group for comparison.

4. Even if all three present, is it possible for Panhellenic to vote all three down? sure

5. I know that usually expansion is one group at a time, but are there cases where a college would hold expansion for two sororities to come on campus? If so, would the process be any different? For example, maybe pick ABC for fall expansion and XYZ for spring.

yes it's possible and no, the process wouldn't be markedly different.

Thanks.

you're welcome!