<human>: Provide a brief overview of the text.

My grandma turned 75 yesterday.  My aunt (50/f) planned a whole birthday weekend to celebrate.  Friday night food and drinks at her house.  Saturday church and a nice dinner.  Sunday bowling and fun at an arcade.

I told her my gf (25/f) and I would be able to come to the party friday night and bowling Sunday but I'm busy on Saturday.  Well it's Friday night and my girlfriend and I both had to work all day, and neither one of us feels like leaving the house.  I really don't feel like going but I can't think of any excuse.  I still want to go Sunday cause I know it would mean alot to my grandma.  So I can't really say I'm sick and then show up Sunday ready to bowl and run around and play games.  Any ideas?
<bot>: My aunt planned a big weekend long bash for my grandmas birthday.  I committed to Friday and Sunday but don't feel like doing anything tonight.  I need an excuse.