Store events (5)
I believe the answer is:
'store events' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sales that I've seen before include "Opportunities to sell" , "Cheap offer periods" , "Periods when shops sell goods at discounted prices, bargain times" , "commercial exchanges" , "Periods when shops offer goods at reduced prices" .)