This would have been the May lecture. Perhaps on a less grand scale a members garden would have been open this month as part of the NGS here are some pictures from there.
We may not be able to visit them but our President Valerie Willis sent this link for more gardens to look at
Great Gardens to Visit 2020 – https://www.instagram.com/gardens_to_visit/
Why not put some pictures from your garden up for all to enjoy