Thursday 19, is the Fedora 28 Upgrade Test Day.
Test days in Fedora are days dedicated to test some novelty or some particular aspect in the operating system. Nothing hard and nothing you cannot test during the other days. The point is that people involved in development and people willing to help in testing new and old features (assuring that they still works during a development cycle) can join the #fedora-test-day IRC channel and meet other people in order talk about the topic of the day. These days can be useful to learn something new and to track down new bugs, all togheter. In order to take part to test days you don’t need to be an expert: just follow the instructions listed in the event wiki page, and report the result.
You can find more info on Upgrade Test Day here: https://communityblog.fedoraproject.org/fedora-28-upgrade-test-day-2018-04-19 And more info on Fedora Test Days in general: https://fedoraproject.org/wiki/QA/Test_Days