Large game groups

[jtanzer]

There's two things you could try. First, you could try the Open Table concept in order to control group sizes. You have a certain number of slots available at your table, and they're filled on a 'first come, first served' basis.
The second thing you could do is try using spotlight balance to keep people from getting bored. Yes, the scenarios required become more complex, however that's a matter of practice and being able to prep efficently.
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The best villians are the ones the PCs create.