I agree to Designer that more often would be great. Not monthly in my opinion but
YES -
more often then once a year please.
Although outcome is not that great (some particles and no drop normally) and effort
is very high (long waiting times, long time inside, much EXP!) i totally like it as:
It is about communication with people!
Find a group, explain how event works, communicate with humans to find people...
All that made us have huge fun in level 9+10 and we have been in the maximum number
of 5 times...
But most important thing for next time: Please create news or flood for it as most people
dont even know about event...