Since an answer to the question "was there ever any motorsport at Wisley airfield" was made within a now "disappeared " (after one day) posted thread, I'll make one further attempt to give a helpful answer, for the sake of history.
Yes, there was.
The Happy Eater Rally was itself a surreal event. A mixture of stages and selectives running partly in perhaps the most unlikely area for any serious competitive rally: London, in September (?) 1977. I believe it ran again the next year but by then I was living in the USA and not involved in any way. Special Stages 24 and 25 in 77 were at Wisley airfield and SS23 was at nearby Ockham Common. Main Controls were mostly at Happy Eater roadside restaurants and food vouchers were redeemable at each. There were also stages at Beddington Sewage Works, near Croydon, (but no sign of Lewis...).
The entrance/exit to the Wisley stages was down the short road off the A3 that went to the hangars. Like many of the stages they were somewhat uninspiring and, as far as I recall as navigator, used the runway and connections to a sort of taxiway to its south.
Given the mysterious demise of the earlier thread, there was always something a bit strange about Wisley too. Ostensibly Vickers/BAC flight test centre, I believe it was government owned until its final disposal. Ron Dennis cast eyes on it for the new HQ but was rebuffed and later tried to get Lydden Hill.
Why did the Government hang on to it so long? It's now no secret that emergency WW3 evacuation plans to site code name "Turnstile" for the government involved Northolt airfield (to Colerne?) and the GW railway to Box Tunnel. Was Wisley Plan B?