Don't treat ongoing events as passed events

Events that are ongoing are treated as if they are passed events. They don’t appear in the instance home page, if they are the only event in a category that category doesn’t appear in the « view all categories » page, and they don’t appear in the « my events » page unless one selects to view passed events.
This doesn’t make all that much sense, as in many cases one may still join an event that has already started, especially if that event is multi-day.
Surprisingly enough, ongoing events do appear under « view more events », which is the way to go.