Clarification needed: are you looking for a language other than English? In English the way you said it is just fine.
buena fiesta
una "gran fiesta"
ont une grande fête
c'était une grande fête
Dulce fiesta/fiesta dulce Be aware that this translation does not have the same connotation in Spanish as it might in English. In most of the Spanish-Speaking world it does not mean "great party" as it does in English. If you mean to say it was a great party then the best translation is "gran fiesta"
As in a really good party, "Una fiesta buenisimo". As in a really big party, "Una fiesta grande".
eine große Party is the translation in German. It is translated from English to German. German is mostly spoken in the European countries.
You Say Party was created in 2004.
You Say Party ended in 2011.
You can say something like, "I really appreciate the invitation to your party, and I wish I could be there. Unfortunately, I have other commitments that I can't change. I hope you have a great time, and let’s catch up soon!"
Great Turkey Party was created in 1983.
Great Anatolia Party ended in 1992.