[BirdOPrey5]

This is the exact code I have working right now on my test forum:

<vb:if condition="gmdate('D') == 'Sat' ">
TESTING!!!!
</vb:if>

If I change Sat to any other day, it doesn't work. Yesterday it worked with Fri instead.

I have this working in my Navbar template.

I've never used widgets, do template conditionals work in them at all?

I did notice a limitation, gmdate returns Greenwich Mean Time, so it works when it's Wednesday in Greenwich, England.
http://us.php.net/manual/en/function.gmdate.php

Unfortunately vBulletin doesn't seem to allow the regular date() function which returns the local date, so this may not work well for you anyway.

FYI- Your code pasted into my navbar works fine.