Attender
Attender is a noun describing a person who attends a place, event, or service. It is a less common equivalent of attendee; while attendee is the standard term in modern English, attender appears in some formal, historical, or specialized contexts. The word can also refer to someone who attends to a task or a person, though this usage is rarer and often replaced by attendant or caregiver.
Etymology and relation to similar terms: Attender is formed from the verb attend with the agent suffix
Usage: In event management and formal documentation, attendees is the common term, but attender may appear in