Thirty-four local swimmers and three instructors went swimming Friday in Flowery Branch to try to set a Guinness World Record and promote swim safety. Billed as The World’s Largest Swimming Lesson by the nation’s water safety and training organizations, the fifth annual event’s message is that swimming lessons save lives. Simultaneous events were held at pools around the country beginning at 11 a.m. Organizers hoped for more than 40,000 participants, according to the WLSL.com website.