UFC on FX 4 is booked for Friday June 22nd
and UFC 147 is expected to still be on June 23rd in Brazil.
Back to back nights of good UFC cards. Has this happened before, (with the exception of the TUF live and a card the next day)
Not that I can ever remember! That will be a killer weekend... Definitely a gd way to hopefully get some more PPV buys... If Fridays free card is good and brings in some new eye balls, those could translate to more buys... Either way 2 nights of fights sounds like a real treat to me!! 
UFC 147 was originally scheduled for the 16th of june... which means FX was a planning on having a 2hour live event UFC programming every week (fight nighton the 1st, 8th, 22nd and UFC prelim specials on the 16th.