This task is about reading the given passage and construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) its answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses same words or phrases given in the passage.

Kerry was arrested on May 30, 1971, during a VVAW march to honor American POWs held captive by North Vietnam. The march was planned as a multi-day event from Concord to Boston, and while in Lexington, participants tried to camp on the village green. At 2:30 a.m., local and state police arrested 441 demonstrators, including Kerry, for trespassing. All were given the Miranda Warning and were hauled away on school buses to spend the night at the Lexington Public Works Garage. Kerry and the other protesters later paid a $5 fine, and were released. The mass arrests caused a community backlash and ended up giving positive coverage to the VVAW.
When was Kerry arrested for protesting?