After nearly 18 months of construction on seven acres of new outdoor gardens, the Greater Des Moines Botanical Garden invites the public to celebrate the milestone with a series of ceremonial grand opening events Oct. 2-4, including a public tour and recognition reception for key supporters on Thursday, free admission to guests on Friday. The events will conclude Saturday with the Botanical Garden's annual symposium featuring a lineup of plant explorers from around the country. More details can be found online.