ANYCOLOR 旗下 VTuber 事務所彩虹社（にじさんじ）盛會「にじさんじフェス2023」（Nijisanji Fes 2023）年初確定 12 月 23、24 日在東京國際展覽館舉辦，稍早執行委員會宣布活動六大節目，預計 22 日舉辦前夜祭，粉絲須註冊多玩國 niconico 收看本次活動的直播。
Nijisanji Fes 是彩虹社全球成員大集結的年度盛事，逾 150 位成員集結參與舞台節目、現場演唱會、遊樂設施、展覽攤位等活動，也將舉辦「前夜祭」預熱氣氛。
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本次前夜祭樋口楓、夢追翔、「Nornis」、「VΔLZ」 樂團登台演唱，早瀬走與 niconico 藝人百花繚亂（高月俊）擔任線上 MC 與現場主持。
同日健屋花那、百花繚亂與 MC 笹木咲、風楽奏斗 會進行前日 SP 「執行委員會通訊」，介紹會場的攤位、周邊商品與零食，讓線上觀眾也能感受親臨活動的氣氛。文化祭兩日，百花繚亂也將對現場粉絲進行「突襲採訪」，健屋花那則負責第一天活動的官方報導。
而粉絲若要收看「前夜祭」與「執行委員會通訊」，須先訂閱彩虹社的官方 niconico 頻道，其他 DAY1+DAY2 執行委員會通訊、活動演出等四個直播，都可以直接在彩虹社 niconico 頻道收看，也有另售串流平台門票。
原創周邊與現場販售食物：
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Nijisanji Fes 2023 前夜祭 / 會場突撃採訪：2023 年 12 月 22 日（日本時間）16:45~17:45
收看網址：https://live.nicovideo.jp/watch/lv343239855
Nijisanji Fes 2023 前夜祭／ 最速感想放送：2023 年 12 月 22 日（日本時間）20:30~21:30
收看網址：https://live.nicovideo.jp/watch/lv343472100
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Nijisanji Fes 2023 執行委員會通訊-前日 SP：2023 年 12 月 22 日（日本時間）21:30~23:00
收看網址：https://live.nicovideo.jp/watch/lv343239963
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Nijisanji Fes 2023 DAY 1 官方直播：2023 年 12 月 23 日（日本時間）9:50-18:00
收看網址：https://live.nicovideo.jp/watch/lv343239963
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Nijisanji Fes 2023 執行委員會通訊-首日報導：2023 年 12 月 23 日（日本時間）21:30～23:00
收看網址：https://live.nicovideo.jp/watch/lv343356294
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Nijisanji Fes 2023 DAY 2 官方直播：2023 年 12 月 24 日（日本時間）10:00～19:30
收看網址：https://live.nicovideo.jp/watch/lv343239986
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Nijisanji Fes 2023 特設網站URL：es.nijisanji.jp/2023/goods
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