BOGO events (5)
I believe the answer is:
sales
'bogo 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 "Periods when shops sell goods at discounted prices, bargain times" , "Occasions for buying at reduced prices" , "Public auctions" , "a feature of Boxing Day?" , "Marketing" .)