Oxford University offers an interesting range of one-day courses, which seem to be open to the general public. For just £46, for instance, you might choose to sign up for a day school on 10th October, entitled 'Space, Time and the Universe'. Quite how accessible the event is, however, remains open to question.
The agenda provides a few clues.
10.00 am Special Relativity
11.15am General Relativity
1.00pm Space-time and black holes
2.15pm Space-time and the universe
Imagine the coffee breaks.