while, gathering, regarding

Yesterday morning, a client visited my office for a consultation, while some children came for English lessons.

In the afternoon, I hosted a Chinese gathering at our café, and at the same time, a middle school student and an elementary school student came for English lessons.

Afterward, I went to the hospital to meet a client regarding judicial scrivener work.

This morning, I plan to host an English gathering at our café, then take my mother to the chapel for worship.

In the afternoon, a middle school student is scheduled to come for a lesson.