I know that it's essentially the bridal shower stag combined, but no one in my family can seem to figure out exactly how to do this. I've told them multiple times that it's bad etiquette for me to really be a part of it at all, but hey times change and they need some help too! lol 
So, my mom is absolutely positive that this is the kind of event that calls for a DJ and a dancefloor. I told her I didn't think anyone would be dancing, and that mixed cds for background music would be fine... but then she assured me people would expect to be dancing. (?!)
My sister says that you charge for tickets, (she mentioned $25) to cover the cost of the hall, the food/catering, decorations, any prizes that may be given out, and then whatever is leftover would go to myself and the groom.
My other sister said that you don't charge for tickets, but that you and the groom register for gifts instead, that way there's something for the guests to see at the event (the opening of the gifts)...
