From English - German Ding/FreeDict dictionary ver. 1.9-fd1:
partier /pˈɑːtiə/
[coll.] Festbesucher <masc>, Partybesucher <masc>, Partygänger <masc>, Partygeher <masc>
Synonyms: party goer, partygoer
see: attender, attendee, -goer, attenders, attendees, race goer, discogoer, clubgoer, clubber, festival goer, festivalgoer, festival attender, festival attendee, gallery goer, gallerygoer, carnival goer, carnivalgoer, carnival reveller, cinema goer, film goer, moviegoer, church goer, churchgoer, Mass goer, church attender, church attendee, worshipper, worshiper, concert goer, concertgoer, concert attender, concert attendee, bar goer, bargoer, pub goer, restaurant goer, restaurantgoer, matinée goer, matinéegoer, fair goer, fairgoer, mosque goer, mosquegoer, opera goer, operagoer, beach goer, beach-goes, beachgoer, zoo goer, zoogoer, theatre goer, play goer, theatergoer, playgoer