Adjust tournament timing to user's time zone.
Have the tournament adjust displayed times for user's time zone (automatic for registered users) or user set via a drop-down menu on the tournament (usable by registered or unregistered users).
This would be very handy for online tournaments that take place across multiple time zones (my organization has members around the globe). It would also help when tournaments overlap with daylight saving changes (particularly since different parts of the world change on different, e.g. the EU and USA change 2 weeks apart) and the Northern and Southern hemispheres change in opposite directions.
Also, many places do not observe daylight saving (like where I live in N Amer).