Projection for a large audience

I am completing a 30 minute program originally intended to be viewed as a DVD on a television monitor. The funders now want to project the program at a theater to a large audience. It was shot on interlaced mini DV by a competent cameraman with fairly good lenses. The program looks great on a television monitor but I'm concerned about image quality if it's projected on a large screen. The theater holds about 500 people and the projection throw is at least 75 feet. Are there any tools or processes that I should consider before showing the program on a big screen?

Overall, do you think it's better
to play the program from tape rather than a DVD?
If you take your tape to DVD you will need to compress. For 30 minutes probably not that much and you won't notice a picture quality difference.
DVD is physically smaller and easier to carry to and from the shoot than a beta deck. I don't know that you'll have a significant quality difference between beta and DVD.
I've used both on large screen presentations. Just make sure you have back-up discs and tapes whichever format you choose. All you need is a clogged head or scratched DVD disc to screw up the works.

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