In English, you can describe activities people do during Cold Clothes Day (Hanji) in the following way:

During Cold Clothes Day, people engage in various activities to honor their ancestors and express gratitude for their care. Here is a brief essay on the activities:
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Title: Activities on Cold Clothes Day
Cold Clothes Day, also known as Hanji, is a traditional Chinese festival celebrated to honor deceased ancestors. It falls on the 7th day of the 7th lunar month. On this day, people engage in a variety of activities to pay their respects and to maintain the cultural traditions. Here are some of the common activities that people partake in during Cold Clothes Day:
1. **Offering Cold Clothes**: The most significant tradition is offering cold clothes, such as blankets, to the spirits of their ancestors. These offerings are believed to keep the spirits warm during the cold winter months.
2. **Making and Eating Mooncakes**: Mooncakes, a type of pastry, are typically prepared and eaten during this festival. They symbolize the full moon, which is often associated with reunion and harmony.
3. **Visiting Ancestral Homes**: Families often visit the graves of their ancestors to clean and pay respect to their resting places. It is customary to leave offerings of food, tea, and incense.
4. **Lighting Lanterns**: Lanterns are lit and placed at gravesites to guide the spirits back home and to signify the warmth and light that the living provide.
5. **Setting Off Fireworks**: In some areas, fireworks are set off to ward off evil spirits and to welcome the spirits of the ancestors.
6. **Offering Paper Money**: Paper money and other symbolic items are burned to provide the ancestors with resources in the afterlife.
7. **Performing Rituals**: In some communities, rituals are performed by a shaman or a Taoist priest to communicate with the spirits and seek their blessings.
8. **Feasting and Gathering**: Families and friends gather to celebrate the festival with a feast, sharing stories and memories of their ancestors.
Cold Clothes Day is a time for reflection, gratitude, and the continuation of cultural practices that connect living families with their ancestors. It is a day of remembrance and respect, filled with traditions that have been passed down through generations.
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As for how you would say "人们在寒衣节做什么活动" in English, you could simply say:
"What activities do people do during Cold Clothes Day?"
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