"it'll be all right on the night" meaning in English

{
  "etymology_text": "Originally said about the problems encountered during the final dress rehearsal before the premiere (first night) of a performance.",
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "phrase"
      },
      "expansion": "it'll be all right on the night",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "British English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Although it seems problematic now, it will ultimately succeed."
      ],
      "id": "en-it'll_be_all_right_on_the_night-en-phrase-RSHEbdoN",
      "raw_glosses": [
        "(UK, informal) Although it seems problematic now, it will ultimately succeed."
      ],
      "tags": [
        "UK",
        "informal"
      ]
    }
  ],
  "word": "it'll be all right on the night"
}

{
  "etymology_text": "Originally said about the problems encountered during the final dress rehearsal before the premiere (first night) of a performance.",
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "phrase"
      },
      "expansion": "it'll be all right on the night",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        "British English",
        "English entries with incorrect language header",
        "English informal terms",
        "English lemmas",
        "English multiword terms",
        "English phrases",
        "English rhyming phrases",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "Although it seems problematic now, it will ultimately succeed."
      ],
      "raw_glosses": [
        "(UK, informal) Although it seems problematic now, it will ultimately succeed."
      ],
      "tags": [
        "UK",
        "informal"
      ]
    }
  ],
  "word": "it'll be all right on the night"
}