Partei = political party; Party (loan word from English) = fun gathering. Fete and Feier would also be appropriate words for latter, if you want something that sounds less English-like.
Also, the translation that I gave you is formal (Sie sind). You could also make it informal and singular (du bist) or informal and plural (ihr seid).
"Das Wort hat, ... als ich Wittenbergisch Bier mit meinem Philipp und Amsdorf getrunken hab, also viel getan..." - Martin Luther
On Deck: American IPA, Märzen
In Bottles: Prime Abbey Singel, Vespers Abbey Dubbel, Terce Abbey Tripel, Compline Abbey Quad, Dragon's Tail Barleywine, Boyne Mead