I think I've found the problem - for some reason, you haven't completed the task completefence03 (‘Go to the kitchen to send Mia out’) from the quest ‘Complete the planned fence’, while all the others (02,04,05,06) have been completed and you have 20,036 wood. You haven't used any cheats, have you?
Well, never mind — run completefence03.is_done=True in the console, exit and re-enter your room — the event will start and after that a new quest ‘Repair the ski lift’ will be added.
I don't know if this is the only bug, but you can continue playing.