To go to a ancestral worship or to celebrate the Ancestor Worship Day in English, you might say:

"I am going to honor my ancestors at the tomb-sweeping festival."
Or, more specifically, if referring to a specific ancestral worship ceremony:
"I am attending the ancestral worship ceremony today to pay my respects to my ancestors."
"Tomb-sweeping Day" is the English equivalent for the Chinese festival known as Qingming, which is a time when people traditionally visit graves to pay their respects to their ancestors.
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