Jugglers needed (base version): 6 good
The moveable feast is a variation on the clock, where every juggler passes to all the others in turn, including themselves. The jugglers start in 2 lines facing each other and pass to the person opposite them. So, no matter how many people join in, there are no awkward long passes.
These diagrams for 10 jugglers should give you a good idea of the pattern,
even if they don't show a full cycle. Here are a few more tips:
If you have an odd number of jugglers, then there will always be somebody changing line. See the diagrams under for 9 jugglers.