In the organizer's words:

FROM THE END OF OCTOBER TO MARCH, THE EVENT WILL ALSO TAKE PLACE IN THE BRIGHT, DRY AND PROTECTED DEEP GARAGE!
The flea market at CITTI-PARK in Kiel is one of the largest events in the state capital. This is where the whole of Kiel comes together to stroll and haggle. The excellent transport connections make this flea market a magnet for visitors.