Something About Carly on a Hot Tar Roof - S1.E20

Carly is planning Sarah's 12th birthday party, and they both want to make sure the girl's oft-absent father Sheldon attends. After he's been pinned down on a date and invitations are mailed, Sheldon asks if the date can be changed to accommodate some important business. Carly goes to all the trouble of notifying guests of a new date when Sheldon asks to change it again. Carly and Jack wonder if Sarah can take the disappointment of her father missing her party, but she has an unshakable, if seemingly unfounded, belief that he'll be there.