What holiday was Ellen celebrating when she went to synnagogue in Number the Stars by Lois Lowry?

In "Number the Stars" by Lois Lowry, Ellen is celebrating Hanukkah when she goes to the synagogue. The story takes place during World War II in Denmark, and her visit to the synagogue highlights the Jewish community's traditions and the importance of faith during a time of persecution. Hanukkah, the Festival of Lights, symbolizes hope and resilience in the face of adversity.