LORELAI: But if you’re gonna be in the area Thursday night, you can come with us to the dinner.
CHRISTOPHER: But it’s Sookie’s rehearsal dinner.
LORELAI: Oh, she would love it. She’s cooking for a thousand. It’ll be fun.
Sookie and Jackson’s wedding rehearsal dinner is on Thursday, and Lorelai invites Christopher to it, since he already offered to take Lorelai and Rory out to dinner that night. The Gilmore girls are strangely un-curious about how and why Christopher is suddenly so available for outings with them, and neither bothers to ask where Sherry is, or why she isn’t coming too.
Note we get another day of the week reference to keep us on track. The wedding rehearsal is Thursday, the elections are Friday, the wedding is on Sunday. Got it?
The Annotated Gilmore Girls 