The inspection checklist in the manual was a copy of last year's. Rule
M7 has always said that team numbers must be displayed on all 4 sides. It is a very easy mistake to make. I'm sorry that it had to happen to you.
You have all day on thursday to put team numbers on. looking at this picture, it shouldn't be too hard to find a place to put them. just mount some more polycarb

I'm sure there will be teams at your first event that would be willing to help you too.
jnadke, that comment was uncalled for, he did read the manual, as the inspection sheet is included in the manual.