Please find the following link to the German frontpage with information regarding the end of the event:
http://www.diesiedleronline.de/de/startseite]
This translates roughly as follows (apologies for the bad translation, please check the original German):
Maintenance / end event
Dear Settlers
A restart of all game worlds will take place on Tuesday morning.
Worlds: all (1-14) closed*
Start: Tuesday, about 06:00 clock
End Date: Tuesday until 09:00 clock
Adventure: maturities be extended
Normal maintenance will also take place this week.
The birthday event ends with this maintenance.
Balloons will no longer be produced.
Current jobs queued in the provision house will be automatically terminated and the resources will be reimbursed.
The event quests will be removed
Information on the winners will be forthcoming this week.
regards
BB_Pandur