Guillermo,

This may be a bit of a hack, but it seems to work for me.  I am using the DateFormat.JS file found HERE but there are other Date Format js files available.  I used this to load the DAY when the form loads into a field called dateTime.  Then you can use Field Rules to determine what fields to show when your Date field = Friday.  

Here is the code:

$(document).ready(function () {
  $.getScript('https://yourformsserverhere/Forms/js/DateFormat.js', function () 
		{ 
      var now = new Date();
      var loadDate = dateFormat(now, "dddd");
      $('.dateTime input').val(loadDate);
  		});
});

Here is the Output:

Hope that helps!

-Nate