Well, I know Scottrade will let me. I have done it before. Looks like E*Trade will let me too since it let me place the order. I am not 100% with Etrade because the market is closed, but it didn't complain.
I have 20 friends/relatives buying in on Tuesday, My neighbor can now be added as he is at our labor day picnic. This long weekend is gonna push it higher than we thought!