We had a 14 day event, that the second week was a MH instead of giving resources to get the Makeda coins.
The 14 day events are alternating between mini MH's and giving resources to gain points on the board, on the second week of the 14 day event. IMO it makes the MH's "less special" since it seems we get some kind of one every month.
I seem to recall we had a yearly MH that wasn't a Leaderboard, where we could craft items from previous events. I miss those. Really really dislike Leaderboards.