I would spreadcheap lawn fertilizer if the area is small. Get the bag with the biggest first number, but do not get the crabgrass preventer. You get the biggest return from the first pound of fertilizer applied, so any N is better than no N. 80 lbs/a of N (about 160 lbs of urea, 46-0-0 is 46% N) would be great if you can afford the fertilizer. A bag of lawn fertilizer applied according to the bag instructions is usually 50 lbs/a of N. If the corn isn't too thick, you can get away with less N as well.

Keep the excess seed cool and dry, and it will be fine next year.