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World Ocean Day is an international day that takes place annually on 8 June. The concept was originally proposed in 1992 by Canada's International Centre for Ocean Development and the Ocean Institute of Canada at the Earth Summit – UN Conference on Environment and Development in Rio de Janeiro, Brazil. Wikipedia

If you do a bit of googling you may find local events. I heard an interview with someone from the Monterey Bay Aquarium talking about the ocean conditions--what has improved (not a lot) and what has not (plastic pollution, habitat loss).