Ideas

Hyperlinks can be styled differently depending on what state they are in.  There are four states:

a:link - a normal, unvisited link

a:visited - a link the user has visited

a:hover - a link when the user mouses over it

a:active - a link the moment it is clicked

I noticed on an event page of a calendar using a custom domain that the links for categories and custom filter options will show a different color when a user has visited them.  I noticed this (screenshot below) that Time.ly follows the practice of showing a different color if a link in the categories, tags, and filter options have been clicked.  https://screencast.com/t/EgfXTQYFpuj1

How long does it take for these hyperlink states to reset?

I ask because the content in the calendar always refreshes so it might discourage a visitor from a previous day from clicking a second time on a tag or category or filter option item they previously clicked.

One more thing, I think the color used for the visited links is too close to (or exactly the same as) the color used for non-hyperlinked text (albeit I may be a bit colorblind).  Should we have underlines under all of the linked text if the visited color stays the same?