Dark mode without Mojave requirement
Please implement Dark Mode in every supported macOS (10.12, 10.13), not just Mojave (10.14).
When using dark mode, if I click on a calendar event, the details popup renders some of the details as black text with a dark grey background. The lack of contrast makes it very hard to read.
On a related note, the rectangular background bounding boxes behind each text element looks very messy - it would be more consistent if the background was translucent like the rest of the dialog, or if there was a single bounding box for each section.
Allow dark mode for all Mojave users regardless of license type