Some of the events that Sumi has appeared in are as follows.

1987 02.14-1987.02.15	4th Nihon Anime Festival at Ikebukuro Sunshine City
1995 10.08	Playstation Expo '95
1995 11.26	YAG Voice Wonderland
1995 12.23	Manga no Mori Bakuretsu Fair at Tsudanuma
1995 12.23	Manga no Mori Bakuretsu Fair at Ueno
1995 12.24	Manga no Mori Bakuretsu Fair at Shibuya
1995 12.24	Manga no Mori Bakuretsu Fair at Yokohama
2008 03.29	[16:30] Lucky Star in Budoukan
2018 09.22	[11:00] Tokyo Game Show 2018 PSO2 Station TGS 2018 SP