Hi Mrs. Barker,

Sorry it's taken me so long to respond regarding the party Saturday (Lisa and I only got back into town a couple days ago from visiting Emily in London).  I had actually already purchased concert tickets for Saturday night, but am currently seeing if I can find anyone willing to buy them from me.  If I am successful in pawning these things off I will be present and accounted for to help Kelly and the gang celebrate.  I will be sure to take your number home with me and give you a call tomorrow to let you know my status either way.

Thanks again for everything,
Susan