Two Year Anniversary of the TARDIS Exploding

So from the standpoint of the show, it's been two years since the day the TARDIS exploded/Amy & Rory's wedding. We still don't know who blew up the TARDIS or why that date. One possible reason was they were trying to prevent River Song from being born and were unaware of the consequences of destroying the TARDIS. We're being led to believe that it was something to do with the Silence, but I personally believe that this was how the Time Lords planned to destroy reality at the end of the Time War. Series 7 ought to provide at least a partial explanation for these things, but it may be some time before the Doctor finally unravels it.