Event planner plugin & contributed list plugin?

Hey all!

Basically, I’m looking for two plugins:

– An event planner. What I want is for any of my users (my WP is closed off, and requires a login) to create an event, propose a few dates and people will be able to vote for each date if it’s convenient for them, or propose a new one. Something similar is available as a stand-alone website at datumprikker.nl; you may have heard of it.

and

– A contributed poll, or poll, of sorts. Basically, a list of options that people can vote on (or like options, to promote multiple votes) or suggest new options, which in turn other users can vote for.

I really hope there are plugins around that fit either (or hopefully both!) of these descriptions. I’ve looked, but was unable to find them myself.

Thanks.