"Ancestors' Day" meaning in English

{
  "etymology_text": "From the primary object of the festival.",
  "head_templates": [
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        "head": "Ancestors' Day"
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      "expansion": "Ancestors' Day",
      "name": "en-proper noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Synonym of Tomb Sweeping Day"
      ],
      "id": "en-Ancestors'_Day-en-name-D-eZTtxG",
      "links": [
        [
          "Tomb Sweeping Day",
          "Tomb Sweeping Day#English"
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      ],
      "synonyms": [
        {
          "tags": [
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          "word": "Tomb Sweeping Day"
        },
        {
          "word": "Ancestors Day"
        }
      ]
    }
  ],
  "word": "Ancestors' Day"
}

{
  "etymology_text": "From the primary object of the festival.",
  "head_templates": [
    {
      "args": {
        "head": "Ancestors' Day"
      },
      "expansion": "Ancestors' Day",
      "name": "en-proper noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English proper nouns",
        "English uncountable nouns"
      ],
      "glosses": [
        "Synonym of Tomb Sweeping Day"
      ],
      "links": [
        [
          "Tomb Sweeping Day",
          "Tomb Sweeping Day#English"
        ]
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
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          "word": "Tomb Sweeping Day"
        }
      ]
    }
  ],
  "synonyms": [
    {
      "word": "Ancestors Day"
    }
  ],
  "word": "Ancestors' Day"
}