Yes, rice dumplings are used to worship ancestors during the Dragon Boat Festival. According to tradition, the Dragon Boat Festival is an important festival to commemorate Qu Yuan. People eat rice dumplings, race dragon boats, hang mugwort, etc. to express their memory and respect for Qu Yuan. Among them, zongzi is an important sacrificial item. People will offer it to their ancestors and gods to show respect and gratitude. Therefore, during the Dragon Boat Festival, people usually offer rice dumplings before starting to enjoy food and other activities.