-It's the largest event of its type in the UK and thousands of people are expected to visit central London to see West End performances for free all weekend.
-Performances are programmed on stage 11am-6pm on Sat and 12pm-6pm on Sun.
-Entry is on a first come, first served basis.
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The actor gave a vivid description of helping a woman give birth in Richmond park in 1963.
The legendary actor said he helped a woman who was giving birth under a tree in London's Richmond Park.
Police want to speak to anyone who may recognise the man.