Someone who attends a convention

Usage examples of conventioneer.

Rather than climbing back onto his stool, he glanced around the smoke-filled bar, which had begun to empty out as both conventioneers and natives drifted away in search of a typically late Roman dinner.

Conventioneers could eat peanuts and drink and cheer like a Monday Night Football crowd as they watched big hyperactive hellraisers get wrestled down and turned meek as mice with a shot.