Here is a summary index of all the hats we saw at events for Emperor Naruhito’s Enthronement

Emperor Akihito’s Abdication April 30, 2019
Crown Princess Masako, Akishino Princesses, Princess Hanako, Mikasa Princesses, Takamado Princesses
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Emperor Naruhito’s Enthronement Ceremony May 1, 2019
Empress Masako, Akishino Princesses, Princess Hanako, Mikasa Princesses, Takamado Princesses
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Coronation Balcony Appearance May 4, 2019
Empress Masako, Akishino Princesses, Mikasa Princesses, Takamado Princesses
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Imperial Enthronement: Morning Court Rituals October 22, 2019
Empress Masako, Akishino Princesses, Princess Hanako, Mikasa Princesses, Takamado Princesses
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Sokuirei-Seiden-no-Gi (official proclamation ceremony) October 22, 2019
Emperor Akihito, Empress Masako, Crown Prince Fumihito, Crown Princess Kiko
Akishino Princesses, Princess Hanako, Mikasa Princesses, Takamado Princesses
Extended Imperial Family: Masako Sen, Yasuko Konoe, Takako Shimazu, Sayako Kuroda, Noriko Senge, Ayako Moriya  
Queen Maxima, Queen Mathilde, Queen Letizia, Crown Princess Mary, Crown Princess Victoria, Inkhosikati LaMashwama
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Second Court Banquet October 25, 2019
Akishino Princesses, Princess Hanako, Mikasa Princesses, Takamado Princesses, Noriko Senge, Ayako Moriya

Third Court Banquet October 29, 2019
Akishino Princesses, Princess Hanako, Mikasa Princesses, Takamado Princesses

Daikyo-no-Gi Grand Banquet November 18, 2019
Akishino Princesses, Mikasa Princesses, Takamado Princesses