Mother’s Day at the WA Maritime Museum Sun 13 May 2018 9:30am – 5:00pm WA Maritime Museum Celebrate this Mother’s Day with free entry to the WA Maritime Museum for mums and grandmums. Plus from 10am - 2pm make your own unique present for Mum with our special message in a bottle activity! We are currently exhibiting the world’s oldest known message in a bottle, and we invite you to make your own. Tell your Mum just how much she means to you, thank her for all the little ways she takes care of you, or remind her of a moment that will make her laugh. The message in a bottle activity is free and materials are provided. Caption: Message in a bottle activity for Mother's Day. Image courtesy WA Museum