I totally agree. I love all the missions I've played so far (especially the 'convoy through the valley' one).
My problem is that I go on at random times, so sometimes there are zero people on the server when I'm looking to fly. (I'm on the East Coast so it's not a time zone issue, just my schedule)
I think all it would take to set up a quick unofficial-official event, is a post on this thread. No special mission would need to be made. I bet that would guarantee at least 10-15 people, probably more, being on the server at that specified time-date (preferably on the weekend).
Just my thoughts. ;)