georgec said:
http://starwars.wikia.com/wiki/Star_Wars_Episode_VI:_Return_of_the_Jedi
The film is set in 4 ABY, one year after the Empire's occupation of Cloud City, when Luke Skywalker and friends travel to Tatooine to rescue their friend Han Solo from the vile Jabba the Hutt.
I win. That's for a guy that ate SW trivia up in the 90s but hasn't thought much of it since.
I believe the EU states that that year was spent looking for Solo, as well, so no time to visit Yoda.