"be there and be square" meaning in English

{
  "etymology_text": "From the phrase be there or be square. Originally in The Simpsons, episode \"Mayored to the Mob\", aired in 1998.",
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      "expansion": "be there and be square",
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  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
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      "examples": [
        {
          "ref": "2000, Network World, volume 17, number 40, page 74:",
          "text": "All nerds welcome. Be there... and be square.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Used to encourage someone to go somewhere considered nerdy."
      ],
      "id": "en-be_there_and_be_square-en-phrase-BSy9Y-cH",
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        [
          "go",
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          "nerdy",
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      "raw_glosses": [
        "(slang, humorous) Used to encourage someone to go somewhere considered nerdy."
      ],
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        "humorous",
        "slang"
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      "wikipedia": [
        "Mayored to the Mob",
        "The Simpsons"
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    }
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  "word": "be there and be square"
}

{
  "etymology_text": "From the phrase be there or be square. Originally in The Simpsons, episode \"Mayored to the Mob\", aired in 1998.",
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
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          "ref": "2000, Network World, volume 17, number 40, page 74:",
          "text": "All nerds welcome. Be there... and be square.",
          "type": "quote"
        }
      ],
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        "Used to encourage someone to go somewhere considered nerdy."
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      "raw_glosses": [
        "(slang, humorous) Used to encourage someone to go somewhere considered nerdy."
      ],
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        "humorous",
        "slang"
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        "Mayored to the Mob",
        "The Simpsons"
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  "word": "be there and be square"
}