a) Vb, by default, has a calander and there is an 'event attendance' hack which can be found here.
b) Depends on what features your looking for. The CMS's available for vbulletin are very powerful in thier own right but it all comes down to what you want and need from a CMS. There is also VBPortal (not-vbulletin affiliated) which offers a paid cms that has alot of extras but take that last one with a grain of salt and read up on it.
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