the MA site under proxy and shipping information says cars must be received by Wed the 22nd and to plan accordingly. Interesting enough, the Nationals site says cars must be received by Thursday the 23rd for the Pro event.
My suspicion is that both Greg and John will do what they can to make sure that all proxy racers cars make it to the race as much as they can...whether that is going to the 23rd for the MA side of it there is no way to tell...but I wouldn't put is pass them. Im sure however, they are not going to formally state that as it puts a bunch of stress on them and others from a setup and planning....
Literally however, I gather once Greg leaves his house the last time before going to the MA race for good then whatever comes after that will miss the race....
If you haven't mailed your cars out yet, id suggest what was mentioned above and go overnight with fed ex as I think that's about the only remaining solution....that is unless you can get yourself to the race with your cars!!!
While part of racing in any league or event is being on time....USPS seems to have a nasty tendency some times to throw a wrench even with the best laid plans....
Good luck to all!!!!