i've read all of these events/gachas ir order:

• phantom thieves vs detectives (event) - ra*bbits; knights; wataru
• happy new year (gacha) - subaru; tsukasa: yuzuru; tori
• opera (event) - akatsuki; tetora; leo; eichi; wataru; chiaki
• amusement park show (gacha) / uncompleted - undead
• chocolate fest (event) - trickstar; ra*bbits; arashi; adonis ⋆⋆⋆
• continuation of the dream (gacha) - ritsu; eichi; hajime; tsukasa; keito
• triumph of the emperor (event) - fine; ryuseitai
• yumenosaki youth radio (gacha) - makoto; shinobu; mao; nito
• compensation festival (event) - undead; 2wink; akatsuki ⋆⋆⋆
• beauties of nature (gacha) - arashi; ritsu; leo: izumi