The phrase "participating guests" is correct and usable in written English.
It can be used to refer to guests who are actively involved in an event or activity.
Example: "The conference will feature a panel discussion with participating guests from various industries."
Alternatives: "active attendees" or "engaged visitors".
Major poets certainly seem eager to participate; guests this fall include Eileen Myles and Brenda Shaughnessy, both part of a series titled "Women We Love, Women We Want to Be".
During a recent show in which I participated, guest experts who have long studied UFOs argued for extraterrestrial presence by showing photographs of putative alien saucers at low altitudes.
At participating hotels, guests get one free night for one paid night; at country inns and B&B's (including five in New Hope, Pa ., the third night is free with two paid nights.
Participating casino guests will benefit from playing a few extra hands at the poker table -- rack up enough casino points, and you could wind up with a discounted (or free) airline ticket.
Liquid guests participating in forming hydrates must be water-soluble and possess the sufficient interaction with surroundings in order to make strong host-guest networks.
Behind her, a symphony of laughter came from guests participating in the activities set up in the backyard of the three-story shingled home.
Daily parking passes are available for speakers or guests participating in events at the Law School.
In the heart of Chelsea, acclaimed Japanese restaurant Dinings has launched a limited-edition menu catering to guests participating in Dry January.
And at Mount Snow resort in Vermont, guests participating in the "family crramp" program are encouraged to leave their devices unplugged and instead relax with their kids.
The game was held as a benefit for World War II community memorials, and two days prior to the event the participating players were guests of Babe Ruth on his weekly radio program.
