Some of the events that Yui has appeared in during the year 1999 are as follows.

1999 09.17	Tokyo Game Show 99 Autumn [business day]
1999 09.18	Tokyo Game Show 99 Autumn
1999 09.19	Tokyo Game Show 99 Autumn
1999 09.23	KSS Group Fan Kansha Day
1999 10.24	Nowanchatte Say You public recording event
1999 11.21	Yuukyuu Ongakusai