Give some stream of consciousness and then the answer. The Dunkirk evacuation, code-named Operation Dynamo, and also known as the Miracle of Dunkirk, was the evacuation of Allied soldiers during World War II from the beaches and harbour of Dunkirk, in the north of France, between 26 May and 4 June 1940. The operation commenced after large numbers of Belgian, British, and French troops were cut off and surrounded by German troops around the midpoint of the six-week long Battle of France. In a speech to the House of Commons, British Prime Minister Winston Churchill called this "a colossal military disaster", saying "the whole root and core and brain of the British Army" had been stranded at Dunkirk and seemed about to perish or be captured. In his "we shall fight on the beaches" speech on 4 June, he hailed their rescue as a "miracle of deliverance".

Answer this question: when did the evacuations from dunkirk beach happen?
To answer the above question, the relevant sentence is: The Dunkirk evacuation, code-named Operation Dynamo, and also known as the Miracle of Dunkirk, was the evacuation of Allied soldiers during World War II from the beaches and harbour of Dunkirk, in the north of France, between 26 May and 4 June 1940.
Therefore, the answer is between 26 May and 4 June 1940.