The official Pocket Monsters Sun and Moon anime website has announced that there will be a Pokémon booth at the Next Generation World Hobby Fair Winter 2019. Some of the voice actors from Pocket Monsters Sun and Moon will be in attendance for a Pokémon Anime Special Live and Talk Stage (ポケモンアニメスペシャルライブ＆トークステージ) event at the booth. There will be special theme song performances by Rica Matsumoto and Okazaki Taiiku. A limited Next Generation World Hobby Fair Sun and Moon multi-stand will also be distributed.

Furthermore, the cast of Pokénchi will be in attendance at the booth on Sunday, January 27th, 2019 at the Makuhari Messe International Exhibition Hall location in Tokyo.

Locations and Dates:

Place: Nagoya Dome
Date and time: January 19th, 2019 - 10:30~11:00/14:00~14:30
Cast: Rica Matsumoto (Satoshi), Kaito Ishikawa (Kaki), Fumiko Takekuma (Māmane), Pokémon Club Member JP

Date and time: Sunday, January 20th, 2019 - 10:30~11:00/14:00~14:30
Cast: Rica Matsumoto (Satoshi), Fumiko Takekuma (Māmane), Pokémon Club Member JP

Place: Makuhari Messe, Tokyo
Date and time: January 26th, 2019 - 10:30~11:00/14:00~14:30
Cast: Rica Matsumoto (Satoshi), Okazaki Taiiku (Theme song artist), Sunshine Ikezaki, Pokémon Club Member JP

Date and time: January 27th, 2019 - 10:30-11:00/12:00-12:30/14:00-14:30
Cast: Nakagawa Shoko, Hyadain, Abareru, Rinka Otani

Place: Kyocera Dome Osaka
Date and time: February 17th, 2019 - 10:30~11:00/14:00~14: 30
Cast: Rica Matsumoto (Satoshi), Fumiko Takekuma (Māmane), Okazaki Taiiku (Theme song artist)

Source: https://www.tv-tokyo.co.jp/anime/pokemon_sunmoon/news/#213658