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; "he was a regular attender at department meetings"; "the gathering satisfied both organizers and attendees"

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

being present (at meeting or event etc.) "attendant members of the congreation"

following or accompanying as a consequence; "an excessive growth of bureaucracy, with attendant problems"; "snags incidental to the changeover in management"; "attendant circumstances"; "the period of tension and consequent need for military preparedness"; "the ensuant response to his appeal"; "the resultant savings were considerable"