Yea the 350 guys usually try and meet up and roll in together so they can all park in the same vicinity. Same with the G35 guys and S2000 owners. Mustang owners. Pretty much everyone tries to coordinate.
Check out this thread, maybe you can meet up with the 350 guys if a lot of Z34 owners don't plan on attending or meeting beforehand:
2010 University of Maryland Spring Meet - MY350Z.COM Forums