Go for it.
No idea about this raffle nonsense, but her parties were always excellent fun in my experience. Don't always expect every advertised girl to turn up, and don't expect Mandy to be a particularly active participant herself. But if you can live with those caveats, it's an excellent way to get to fuck a whole bunch of different girls in a pretty crazy orgy-like atmosphere.
On the other hand, avoid if you're squeamish about seeing lots of guys of all shapes, sizes and ages getting it on in front of each other, or if you're shy about doing so yourself! And don't expect to have a girl to yourself for the whole duration either.
