Shooting CEO on stage telling the company history in a community theater with slideshow

In a few days, I will use a Canon XH A1 to shoot my company's CEO giving a 1-hour speech in a community theater and I could use your suggestions for lighting and sound.

Event:
He will tell a 180 employee audience the story of the company and present a visual history using lots of stills front projected on a massive screen next to him. This is a family owned and run extreme sports apparel company that got started in the 60's with Motocross so I expect it will be rich with nostalgia. (I don't know yet if they will have me or someone else edit this or if they just want me to shoot the whole thing and archive it.)

Venue:
The theater has a sound and light board up in the control area behind and above the audience and some basic overhead stage lighting.

We will front project the slide show from the control area (about 75 feet back and above the audience, hopefully using a typical office projector and a laptop to be tested tomorrow. They have one we can rent if we need to. I will keep the projection size on the screen only as big as needed for the back row to see it and as far from the CEO as practical. CEO on the far left and the projection on the far right of the stage.

We'll use the theater's hand-held mics connected to XLR jacks right on stage near the CEO. These jacks route to the sound board and then out to the house speakers for plays and musicals. I've tested that part and house audio works great.

Recording the best audio into my camera in that circumstance is the question.
Do I dare record the combined live voice and overhead PA audio with my on-camera mic ?
Do I buy some kind of y-connector XLR cable to split the mic cable off to the stage connector and my camera's XLR input?
I don't own an external mic or field recorder.
Are there other options to consider?

Lighting...
All of the theater's available lighting is typical theater lighting, over head other than what ever spills from the projection when the slides are going.

I guess some form of lower, front fill light would be best for the CEO's face, as he's a senior gentleman and he'd otherwise only be lit with stage lights above and maybe slightly back and side lit from projection color spill.

- Should I use a second camera for audience reaction shots to keep it interesting or at least to have this footage as an option?
- Should I use a second camera just for a separate angle on the CEO to help the editor keep it interesting? I don't have another nice camera so it may be a pointless question... or maybe you guys think it's an absolute requirement and I have to find another camera.
- Should I shoot all of this zoomed in from the control area up and back behind the audience or somewhere closer, mid-theater or even closer. I assume close to the stage would be best.
- Whomever edits will have access to the slides being presented so these could possibly be inserted or even composited.I'm comfortable with AfterEffects.

Also, should I shoot this at HD 60i, 30F, or 24F (all 2:3 pulldown-converted) What would you do?

What else comes to mind?

All thoughts and advice will be greatly appreciated.


Thanks,

Kevin Collins
Campbell, CA