Colorful Festival are a type of gacha within Project Sekai with doubled 4* rates and no ties to any events, usually held on celebratory dates such as New Years or the game's anniversary.
They originally held Permanent cards, but then received Colorful Festival-exclusive cards and costumes.
March 2021 - Half-Anniversary Celebration
Yoisaki Kanade - post #6369378
Asahina Mafuyu - post #6369392
June 2021
Kiritani Haruka - post #6369470
Momoi Airi -
October 2021 - 1st Anniversary Celebration (Featured alongside Scramble Fan Festa! cards)
Hatsune Miku - post #5043802
Hoshino Ichika - post #5116882
December 2021 - Happy New Year 2022 (Featured alongside Inori no saki negau ashita wa cards)
Kusanagi Nene -
Kamishiro Rui -
March 2022 - 1.5 Anniversary Celebration (Featured alongside Sekai no sakura tsunagaru omoi cards)
Shiraishi An -
Aoyagi Touya - post #5392363
June 2022 (Featured alongside Minna de enjoy! Spojoy Park cards)
Mochizuki Honami - post #5471448
Hinomori Shiho -
September 2022 - 2nd Anniversary Celebration (Featured alongside Kono matsuri ni yuuyami iro mo cards)
Hatsune Miku - post #5956673
Megurine Luka - post #6507437
December 2022 - Happy New Year 2023 (Featured alongside Shinshun! Shishimai robo no oshougatsu show! cards)
Shinonome Ena - post #6510864
Akiyama Mizuki -
March 2023 - 2.5 Annivarsary Celebration (Featured alongside Koukyou suru Machi no Katasumi de cards)
Kagamine Rin - post #6507491
Kagamine Len - post #6507505
June 2023 - (Featured alongside Ichigo Ichie na Hyakki Yagyou!? cards)
Azusawa Kohane -
Shinonome Akito - post #6510628
(this page is a wip. card post links to be added when they're uploaded)