Just a thought-- while pulling the usual second-guest shtick works without issue 98% of the time, do you want to risk that other 2% occurring on your wedding night.
I actually booked a hotel for my brother on his wedding night at the PHNY and listed a friend as a second guest, and then had him check in before the wedding to make sure that there were no issues. I thought I was so smart until the key deactivated for some reason during the wedding, and my brother was not even listed on the reservation. BH I was able to clean up the mess in the middle of the night (don't remember how), but you don't want to be dealing with that. Also, brides tend to attract attention, which possibly makes the whole second-guest thing more complicated.
Just a thought.