Sailor's call for spring festival (3,3)
I believe the answer is:
may day
I believe this is a double definition.
'sailor's call' is the first definition.
(Mayday or M'aidez is a distress signal)
'spring festival' is the second definition.
'for' acts as a link.
(Other definitions for may day that I've seen before include "International radio signal of distress at sea" , "Emergency call" , "Radio distress call" , "01/05/2017" , "Bank holiday - distress signal (3,3;6)" .)