The phrase "frequent attendee" is correct and usable in written English.
It can be used to describe a person who attends something often or regularly. Example: John is known as a frequent attendee at the local library's book club meetings.
Some people come to TED just to have meetings, a frequent attendee told me.
He speaks passable Spanish and French and is a frequent attendee at Davos, the annual gathering of the global elite.
"I needed an impetus to remember how to do stuff," said Ms. Franks Staub, a frequent attendee.
A frequent attendee of events at the Ed Portal, she is in the process of making a career change.
Huffman has been a frequent attendee at Burning Man, the annual, clothing-optional festival in the Nevada desert, where artists mingle with moguls.
He became a frequent attendee of European and American diplomatic receptions in Havana (he always opposed the American embargo on Cuba).
He asked Chorley – because of her reputation as an energetic champion of families in poverty – to design a scheme in 2010 operating from the Fitton Hill practice, to support frequent attendees at the surgery with complex problems.
J. T. and Xavier, two residents of the Ingersoll Houses, situated across the street from Commodore Barry Park, shared their frustration with the festival's decision to set ticket prices too high for many of the people who live nearby and had been frequent attendees.
We extended thousands of email invitations to frequent attendees of Cityfox events.
"Amongst our frequent attendees, over two thirds have actually accepted our offers of assistance and referrals into other drug treatments, and health and mental welfare services," she said.
And unlike Toobin, who compared Thomas to a schoolchild who is "not paying attention," frequent attendees at the court would agree that the justice is very much engaged at each hearing -- consulting books, looking at his notes, and interacting with Justice Stephen Breyer and Justice Antonin Scalia, with whom he sits side by side.
