I think the 1999 Solar Eclipse is the one memory for me, but many others too.
Unluckily I was at work that day, but managed to make the work day coincide with a certain Cambridgeshire USAF base site day.
I managed to stop the entire workforce that I managed at the time and we all watched the eclipse, no cloud here (sorry John).
It was something I had been desperate to see and see it I did.
As others have said, the evening type of light, sudden plummet in temperature and the birds all confused was memorable as much as the eclipse itself.
This event has stuck with many of that team, all long gone to newer pastures or for some 6ft under sadly, but whenever any of us meet up,
it's the one thing that gets talked about and they start that conversation. The best days work / outreach I have ever had to date.
Before this the weeks of Comet, Hale Bopp are a big memory too.