Dear Sasha
I want to thank you for the invitation to attend your freshman social at the Tri Kappa Sorority on Sunday October 5. I would love the opportunity to attend.
Unfortunately, with my current workload of classes, my involvement in the Student Government, and my position on the basketball team, I honestly do not have time to fulfill the obligations that being a pledge of Tri Kappa would require. I will certainly think about joining your honored sorority in one of the coming terms.
Sincerely