"dress-up party" meaning in English

{
  "forms": [
    {
      "form": "dress-up parties",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "dress-up party (plural dress-up parties)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Parties",
          "orig": "en:Parties",
          "parents": [
            "Culture",
            "Entertainment",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2012 May 24, Nathan Rabin, “Film: Reviews: Men In Black 3”, in The Onion AV Club:",
          "text": "Men In Black 3 lacks the novelty of the first film, and its take on the late ’60s feels an awful lot like a psychedelic dress-up party, all broad caricatures and groovy vibes.",
          "type": "quote"
        }
      ],
      "glosses": [
        "costume party"
      ],
      "id": "en-dress-up_party-en-noun-KkWoUrVh",
      "links": [
        [
          "costume party",
          "costume party"
        ]
      ]
    }
  ],
  "word": "dress-up party"
}

{
  "forms": [
    {
      "form": "dress-up parties",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "dress-up party (plural dress-up parties)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Parties"
      ],
      "examples": [
        {
          "ref": "2012 May 24, Nathan Rabin, “Film: Reviews: Men In Black 3”, in The Onion AV Club:",
          "text": "Men In Black 3 lacks the novelty of the first film, and its take on the late ’60s feels an awful lot like a psychedelic dress-up party, all broad caricatures and groovy vibes.",
          "type": "quote"
        }
      ],
      "glosses": [
        "costume party"
      ],
      "links": [
        [
          "costume party",
          "costume party"
        ]
      ]
    }
  ],
  "word": "dress-up party"
}