Is it possible to have mass said at st. peter's basilica in rome in memory of someone who has died?

Answer 1

I'm not familiar with the set up at St Peter's, so this is very much a guess.
Firstly, did the person specifically request this? If they did, then I would contact you local Roman Catholic office and ask them.
If the person didn't ask and you happen to be going there, then I'm sure they would be happy to do it, but you should write or email them to make the appropriate arrangements.
If you aren't able to attend, then why not go to the nearest Roman Catholic Cathedral and ask them. I realize this doesn't have the immediate appeal of St Peter's, but it would be much better to attend and get have the satisfaction of seeing the ceremony performed and hearing the prayers etc. After all, it's the same God your prayers are going to. The Priest may even let you pick out some hymns or religious music and be prepared to burn a bit of incense if you like that sort of thing.
After all, funerals are for the living, not for the dead. The same applies here, this is for you and your family and friends, not for the deceased.