Some JEs have "festival (day)". I think what's there is enough.

祝日が来てもその意味が分からないで休みだけを喜ぶ日本人にとっては、休みにもならない結婚記念日なんて
どうでもいいのかもね。
Just as public holidays have come to carry little more meaning to the 
Japanese than an enjoyable day off, it looks like wedding anniversaries may 
not mean that much any more.〔【出典】Hiragana Times, 1991年12月号◆【出版社】株
式会社ヤック企画 〕
.
There are some other terms that are in various sources, such as
- festival
- holiday
- fete (day)

@@ -20,0 +20,1 @@
+<gloss>public holiday</gloss>