RORY: I don’t think I’ll have the prom bids ready for the supplemental student council meeting this week … They need a little more time to get the details together, so that leaves a little hole in our agenda.
Prom bids are, as far as I can work out, just another name for tickets to the school prom, a formal dance held at the end of the academic year.
The Annotated Gilmore Girls 
She is referring to collecting outside bids from potential locations for the prom so she can present the proposals to the group for decision.
LikeLike
That’s what I thought (it seemed logical), but when I did a search, it showed advertisements selling prom tickets to students, titled Prom Bids for Sale … ??? The tickets even had Prom Bids written on them.
More references:
https://onthihsg.com/en/best-13-what-is-a-prom-bid/
Click to access Senior%20Prom%20FAQs.pdf
LikeLike