May 20

GREEN THUMBS’ GATHERING

At the Massachusetts Horticultural Society’s annual Gardeners’ Fair at Elm Bank in Wellesley from 9 a.m. to 3:30 p.m., you can score everything from perennials, trees, shrubs, and herbs to gardening tools and free advice from experts. Also at the fair, White Flower Farm’s Great Tomato Celebration, with thousands of plants for sale. 617-933-4900, masshort.org

AMERICAN BEAUTIES

As many as 150 Cadillacs will decorate the Larz Anderson Auto Museum’s lawn area, from 10 a.m. to 3 p.m.; for $10 per adult you can gawk all you want at these sweet rides, plus wander through the Brookline museum’s collection. 617-522-6547, larzanderson.org

May 21

A SMALLER FOOTPRINT

When it comes to living greener, which choices really have an impact? Bring your questions to the Harvard Book Store on Monday, when Jeff Deyette and Suzanne Shaw of the Union of Concerned Scientists will discuss their new book, Cooler Smarter: Practical Steps for Low-Carbon Living. 617-661-1515, harvard.com

May 24-28

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33,000+

That’s the number of military men and women with ties to Massachusetts who have died while serving their country from the Civil War to the present. To commemorate them, the Massachusetts Military Heroes Fund will display more than 33,000 American flags on Boston Common near the Soldiers and Sailors Monument from Thursday through May 28. Names of the Massachusetts service members who died after September 11, 2001, will be read in a ceremony on Thursday at 10:30 a.m. at the flag display. 888-909-4376, www.massmilitaryheroes.org

May 26-28

LAX TIME

The top men’s college acrosse teams in the country face off at Gillette Stadium in the NCAA semifinals and championship. Who will take the title? Keep your fingers la-crossed for your favorite.ncaa.com/championships/lacrosse-men/d1