if u dont have room for dancing, but u do have room for 30 people, do u not see the obvious??? u could cut down a little bit on people and it would do the trick. if u MUST have 30 peeps, then i dunno. depending on how many of ur friends are into music and how much room there is for a stage, u could do what my friend did. we have a lot of people in our school that have bands, or just are really good singers, so we kinda did our own concert. u or a friend could be the host or whatever. i was in one of the bands performing, we just had a little area roped off, we did it in his backyard and even had neighbors come over and such. i dunno, im just saying, u could do stuff outside, or cut down on people...it kinda depends where u are