I think a good solution is to promote 4 with a primary reward. Then provide the rest of the active voting sites as a 'do on your own accord' option, and possibly still include a reward that's minor compared to the primary reward.
A great model to go off is Albion Online's castle sieges, and daily/weekly 'treasure' chests. They've always become large points that would attract groups of over 25 players, mainly due to the great incentives and reliable scheduled nature of things. @Trazil and @TimForReal can add onto that as...
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