Ghostly Question. Please answer :D?

[Rina]

Ok, here's the thing. I am currently doing a school show in a local hall (seats around 700) and dinner time we went to the upper tier and sat right in the back. Me and 2 other people decided to mess about and ask for things to happen (paranormal wise now) so first i asked for 2 knocks, and we faintly heard a knock. (i can 110% guarantee it wasn't the other 2) we freaked out and i asked again to confirm and it was there again (it wasn't strong at all - but it was there). I asked a 3rd and 4th time to make sure it was there, and it happened again. Now the freakiest part. All of the seats in front of us were up, and I asked whilst we talk can you put one seat down. So we spoke for litterally 15 seconds when my friend went "oh my god the seat is down" and it was the seat infront of us, although no one noticed it go down :S. Also my friend goes "give us a sign" and the music went louder (but i think that's coincidence) haha. But tomorrow we want to return, and how can we confirm there's a ghost there. WITHOUT A OUIJA BOARD. something we can do just with ourselves. Also do you think there is actually a ghost there based on what i've said. thanks