Shooting a play

I just received my 30D yesterday from B&H , and tomorrow i'm going to be shooting my sister's 7th grade play. I don't have a tripod just yet, since my other one, i lost the quick release plate, and it was a cheap wal-mart one anyway. So, i am asking, what are some good settings to use, like for aperture, shutter speed, and ISO. I have a good idea of what i should use, but i'm used to using the G6, so any suggestions?

I see you don't have any lenses going lower than f/3.5 or something, so that might be an issue. A 50mm or 85mm prime allowing you to shoot at f/1.8 would be great for this.
A tripod wont help much for moving subjects I'm afraid.

Shoot RAW! I usually use ISO 800 for theater and stuff like that. Av-mode. Biggest possible aperture.
You could also try to under-expose a bit (-1/3 or -2/3) and then adust the exposure as needed in PP afterwards. That will give you quicker shutterspeeds.

Use the flash.

O yea, i forgot to mention that flash isn't allowed.

With the lenses you have, ISO 3200, Av mode, lens wide open, and hope for the best. Hopefully the lighting isn't too contrasty. Metering people under stage lighting can be a great challenge. Use tungsten white balance.

Shooting RAW will save your butt.

Second on the above replies. RAW will help with varying lighting. Most productions use colored gels, lights fade in & out, spots on charachters, etc. I've had the best luck with the 50 f/1.8. I havn't shot any stage work since I got the 28-70 f/2.8, but I can tell you that at ISO 1600 the 18-55 f/3.5-5.6 was bad. Too bad you dont have enough time to pick up a lens or are you close to a shop that rents?

Best of luck to you.

Do you thing that using a filter might increase color? Because i bought an intro set by Hoya, it has a UV, polorizer, and warming filter. Would any of these work in this situation?

My opinion is they will not help you and may create problems (other than the UV filter) If this is you first time shooting an event of this type, you really should try using RAW. The lighting changes faster than you can compensate. Low light will impede focusing speed and you subjects are usually moving!

i agree with the advice given. Bring your IS lens, keep the apertures as open as possible. You can underexpose to keep the shutter speed up but you'll end up with noisy photos, or over expose but end with blurry ones when there's movement.
i prefer sharp noisy photos since I can remove noise later, but if i can anticipate the subject staying still for a few seconds (since it's a play and not a dance) i'd overexpose a little.
if possible find something steady to rest your camera on

Thanks for all of your help guys! I think i'll do fine.