These are permanent competitions (they last forever) on the default tracks shipped with stunts, and on the closed versions of these. Simply download the tracks if you don`t have them, race on it, and send the replay. Rules are simple, you can use any car (not tuned of course!), and replay handling. Your name will be listed here, doesn't matter what place you achieve.
So... closed tracks should really stay.
Btw what about an expanded permanent competition? All the original+closed tracks, separate scoreboard for each cars (original pack + any other non-rocket car ever used in ZakStunts). Since nobody has enough time to play for leading all the scoreboards, it would give a nice and more balanced eternal competition.
I remember 2002, when permanent records were still at human level - any newbies could make a TOP3 result. I think the huge amount of different options would give some enthusiasm to the non-addict players, too.