attendant

noun

1.
someone who waits on or tends to or attends to the needs of another
attender tender
Derived from:
attend
2.
a person who is present and participates in a meeting
attendee attender meeter
Derived from:
attend attendant
3.
an event or situation that happens at the same time as or in connection with another
accompaniment concomitant co-occurrence
Derived from:
attendant