Background Noise Reduction Tips

I'm new to FCPX, having been a long time iMovie user.
I'm editing an 90 minute video of a Christmas program (which includes two 30-minute plays) shot in our church last night. All cast members with speaking parts had lapel mics; but there is a lot of competing background noise from small children and babies (some of whom were crying part of the time) in the audience (mostly the first three rows). I realize there's no magic wand that will take all that background noise out, but does anyone have any tips for reducing/minimizing it so viewers can hear the cast members better?
Thanks.

One thing is if the audio you are trying to remove sounds the same as what you are trying to keep (like trying to remove people talking in the background versus someone speaking in the foreground), then it gets more tricky.
I've had good results using SoundSoap.  It's not very expensive and It works as a plug-in for FCP X - fixed an interview with it last week and the results were impressive.  It will take out background noises, hiss, pops, clicks, etc.
Jeremy
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