Celebrated the day after the message (5)
I believe the answer is:
noted
'celebrated' is the definition.
('noted' can be a synonym of 'celebrated')
'the day after the message' is the wordplay.
'the day' becomes 'd'.
'after' is a charade indicator (letters next to each other).
'the message' becomes 'note' (note is a kind of message**).
'd' put after 'note' is 'NOTED'.
(Other definitions for noted that I've seen before include "Wrote it down" , "Widely known and esteemed" , "Toned (anag.)" , "Remarked - famous" , "Celebrity" .)