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vihru, welcome on the XOOPS forum!
You should have a look at the
modules repository.
For articles, there is the News 1.63 module.
It can also be
hacked for announcing events.
But if you want a real calendar, there are a lot of calendar modules (pical, extcal) and some reservation modules.
Pollies? I don't know what that is.
For documents, there are a lot of download modules (wf-downloads) and some DMS (document mangement system) modules.
Most modules incorporate a permission system on categories, so you can decide which are accessable by who and in which way.
You can easy
search for them on this site.