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

1994 12.04	Seiyuu Grand Prix Commemoration Event
1994 12.10	Seiyuu Grand Prix Commemoration Event
1994 12.11	Seiyuu Grand Prix Commemoration Event
1995 03.25	3DO Real in Akihabara
1995 03.25	3DO Real in Ikebukuro
1995 03.26	3DO Real in Akihabara
1995 06.03	Tokyo Toy Show
1995 06.04	Tokyo Toy Show
1995 08.03	Anime Seiyuu Daikoushin