A lot of people like to wait until all episodes of a show are available before watching, so we can binge the entire season. But it isnt readily obvious when a season has finished. Season lengths vary 3,6,8,10,12,20 seem common, but there is certainly no consistency. Simply putting "Season Finale" or "Final Ever" After the title would be very helpful.
This is a pending feature. If it's something you are interested in seeing, make sure to vote!
https://www.tvmaze.com/threads/1977/highlight-season-premiere-and-finale-in-calendar
Personally would love to have it colored differently on the page. Easier to notice.