It'd be cool to have a 3 wins in a row challenge (like winning nhood1, market2 and museum2). That should be for all players, maybe different points depending on group.
Another challenge idea, is to reward players who are on podium on a certain number of races in a session. It could be like the 'Victory Points' , but with more races (for example 5 for 60%, 7 for 23% and 9 for POD) and less points rewarded.
I support this. Also 5 in a row and 7 in a row wins should be awarded.
what about losing 3 times in a row?