The tenth and eleventh doctors have both been to 1969: Ten was sent there by the Weeping angels (and went to see the 1969 shuttle launch), and Eleven ended up there when he got involved with the Silence (at the same shuttle launch).
Now, I don't know how likely this is, but when Sally Sparrow sees the Doctor he says:
Look, sorry, I've got a bit of a complex life. Things don't always happen to me in quite the right order. Gets a bit confusing at times, especially at weddings. I'm rubbish at weddings, especially my own.
Is this a coincidence? Ten at that time hadn't been sent to 1969, but Martha does mention they'd been to 1969 four times before getting stuck. And the Eleventh Doctor does have a wedding.
Did they meet at all? Is that allowed?