The RAF airshow at Sek Kong in 1978 featured a Vulcan delta-wing bomber which must have been a sight to see manouvering within Sek Kong's valley.
Like most of these shows they were rarely publicised unless you were "in-the know". Only to read about them later in the SCMP the next week.
Only last November while wandering around Central district I came across a very large motorcycle and related car event that had attracted those again "in-the-know" as there seemed to be few members of the general public viewing the exhibits. It was in the area of the old Star Ferry concourse, not behind the Mandarin Hotel where there have been similar events over the years.
Again there seemed to have been nothing publicised in the English press before or after the event.