A bunch of us were looking at the Easter references in the picnic scene. It takes place on Good Friday 2011.
The leader, knowing that he is going to die gathers his friends around him where they share a meal (at the lakeside - very Biblical). He makes a comment about 'I thought I'd never be done with saving you'. Specific reference is made to his drinking wine (he never drinks wine, apparently).
He then goes a little apart from his friends, asking them to watch, and instructing them not to interfere with whatever happens. An individual comes, and he gets killed. (Suggestion that he is betrayed by one of his friends? - is the child in the suit River Song, who is jailed indefinitely for killing a good man?)
There follows a conversation about Saturdays being temporal tipping points (this broadcast on Holy Saturday) and they land on Easter Tuesday (two days after Easter) in 1969.
Are we heading for a resurrection on a Sunday?