Church occasion created by commercial outlets — and in Germany, indeed! (6,6)
I believe the answer is:
advent sunday
'church occasion' is the definition.
'commercial outlets and in germany indeed' is the wordplay.
'commercial' becomes 'ad'.
'outlets' becomes 'vents'.
'and in germany' becomes 'und' (German for 'and').
'indeed' becomes 'ay'.
'ad'+'vents'+'und'+'ay'='ADVENT SUNDAY'
'created by' acts as a link.
(Other definitions for advent sunday that I've seen before include "27th November?" , "Start of liturgical year for Western Christians" , "first opportunity to open calendar?" .)