The phrase "regular participants" is grammatically correct and can be used in written English.
Example: The book club had a core group of regular participants who attended every monthly meeting.
A comparison of the background data between those who are regular participants (≥ once a month), and those who seldom or never participate (< once a month).
Some regular participants said the event had become too big.
"At every card table in the world, there are regular participants whose skill and understanding are almost nonexistent".
Other regular participants included Mr. Gonzales and Gen. Michael V. Hayden, then the director of the National Security Agency, which conducted the eavesdropping program.
At Basildon Sporting Village in Essex, the inclusive, accessible programme she has developed with sports coaches and staff attracts 70 regular participants and 300 visits a month.
I was part of the movement the club made from being an ambitious, underachieving one to regular participants in the latter stages of the Champions League.
Silverman has participated for more than a decade as a regular participant on KBDI Channel 12's award winning Colorado Inside Out show.
Swisher was a regular participant in many conferences devoted to the digital era.
This installation, "Diamond Gym," is by Nari Ward, a regular participant in international exhibitions.
She was a regular participant at "Star Trek" conventions for fans.
A distinguished gentleman, Fred was a regular participant at Hunter events and a much loved member of the Hunter community.
