attendant

Someone who waits on or tends to or attends to the needs of another.

A person who is present and participates in a meeting.

An event or situation that happens at the same time as or in connection with another.

Occurring with or following as a consequence.

“an excessive growth of bureaucracy, with attendant problems”

“attendant circumstances”

Being present (at a meeting or event, etc.).

“attendant members of the congregation”