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The bucket is not a bad call
I found what really caused problems for me on Sunday is when I was forced to ride through fallen leaves - these would mix with the mud and VERY quickly jam up the bike. If I could manage to avoid straying off the pure mud into the leaves then I seemed to fair a bit better.
Also when getting off to run - carrying rather than pushing the bike.
As mentioned - this still meant me having to stop multiple times to pull masses of crap out of the front fork/brake, so what do I know :)
danb
Regular frame polish helps a bit. But there's not much you can do to prevent clogging, particularly if the mud is sticky.
It depends on the course, but try and limit the number of gears you use, if there is any section where you need to get off and run, try and clear some mud away with your hand as you run and, if it gets really bad, stop and clear out the worst of it.
I've toyed with the idea of having a bucket of water in the pit, as a quick brush down would be suffice to keep you going, but as I usually ride to events it's a non-starter.