It was a typo.....May 15th . If you follow the link it is in there somewhere....From what I read... That was 15th of April, 2007. Here is what the registration form says:
"Mail registration form and check or money order before April 15th to:
All Mopar Spring Roundup
3912 NE 140th St
Seattle WA 98125"
I guess, I can still show up and pay the $25.00 and get to park with everyone else... At least I hope there is room???
Looking forward to meeting others,