You must defeat the December boss before the end of 12/22. On 12/23, you will get a phone call from one of your Social Link party or family members asking if you want to hang out on 12/24. Choose and spend the day with them, unlocking the following equitable accessory for the rest of the game (these do not carry over to New Game +).
Gift | How to unlock
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Fancy Mini-Car (Mudo Boost) | Spend 12/24 with Yumi.
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Fluffy Muffler (Resist Ice) | Spend 12/24 with Chie.
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Hand-Knit Mitten (Hama Boost) | Spend 12/24 with Ayane.
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Handmade Watch (Ailment Boost) | Spend 12/24 with Naoto.
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Leather Keychain (Resist Fire) | Spend 12/24 with Yukiko.
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Macho Medal (Resist Physical) | Spend 12/24 with Yosuke, Kanji, and Teddie.
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Rugged Ring (Divine Grace) | Spend 12/24 with Ai.
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Silver Bangle (SP +50%) | Spend 12/24 with Rise.
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