I've already done something like that before. I recommend you to take a look at Daniel Greene's pre-mixtured palette. You can mix it all in about 20 minutes and you won't regret taking the time to do so.
Do two fast sketches before the event, this is a great warm-up.
Vignettes are fast and charming.
Well, I'm against the photographs, specially if they are taken by another person, but that's my opinion only. I think that most professional photographers don't know anything about portraits and amateurs are a total disaster.
I wish you the best of luck.
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