Did some of my best sessions when in Reading AC when the turnout was poor. Always went but if I ended up by myself I could do exactly the sort of session I wanted and having made the effort to get out I never had any trouble doing it properly.
Novelty airfield race sounds quite fun - there's a midnight 5k at Bristol Airport every year I'd been invited to once but as they've clamped down on security it looks unlikely "civilians" can run it now.