I think you should go on the trip cause like you said it is a once in a lifetime experience. You may never get taht opportunity again, but whenever you do join that sorority, that is something that you will have for life. And if you have to do it grad, don't let that discourage you, cause the grad chapters that I have been exposed to are involved in everyway that the undergrad chapters are, they just do more work. Good luck with your decision, I hope this helped.
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