Thump; party (4)
I believe the answer is:
bash
I believe this is a double definition.
'thump' is the first definition.
(thesaurus)
'party' is the second definition.
(term for a party or celebration)
(Other definitions for bash that I've seen before include "Social event - clobber" , "Try - rave-up" , "Party; beat" , "knock" , "Criticise -- social gathering" .)