Individual Events work, but not archives or main page

A few questions, the main one is that I'm getting a page not found error when going to (it's actually in sub-directory while I'm building).

I've already changed the permalinks to default, then back to post-name. (I even got the little message that told me I couldn't use *default* with the events+ plugin.)

Also, are times required in the date fields? I put them in in my first two events, but sometimes we'll know when something starts, but not when it ends. We can cope, we just need to know.

Sidebar list widget only shows one of our two upcoming events, even though I've set it to show 5. It seems to have code in there for 'popular' events, which I don't see a setting for.