Do Jews celebrate secular holidays?
Yes, Jews have always observed civic and secular holidays. Some synagogues have a national flag on display and many synagogues participate in interfaith observances of holidays such as Thanksgiving and Martin Luther King, Jr. Day. Mishkan T'filah, the prayerbook of the Reform Movement contains the national hymns of Israel, Canada and the United States. ReformJudaism.org has a number of prayers and blessings for the commemoration of secular holidays.