Tales Told by the Rocks at Thacher Park. 10  a.m. Explore the basics of Thacher Park geology. Find out what makes the park so special, and then take a walk to check out some limestone landscape features and look for ancient fossils. Meet at Thacher Visitor Center. Call 872-0800 to register.

Renaissance Festival event with jousts and other performances all day, food and souvenir vendors. 11 a.m. to 6 p.m. Saturday and Sunday. Indian Ladder Farms 342 Altamont Rd, Altamont, NY 12009. Cost: $13 for adults, $6 for children ages 3-12 (2 and under free). More info at www.nycapitaldistrictrenfest.com

Town of Westerlo Heritage Museum Town Wide Garage Sale from 8:30 a.m. to 3:30 p.m. Maps will go on sale at 8 a.m. Refreshments, bake sale, and restrooms will also be available at the Town Park, 950 CR 401 Westerlo, NY 12193.

The Switzkill Farm Board would like to invite all interested individuals to participate in the first-ever Switzkill Farm Bio-Blitz at the farm, starting at 9 a.m. Volunteers will work in teams to locate and identify living organisms in the beautiful woods, fields, streams and ponds, of the property.

Sale: 10 a.m. to 4 p.m. Tools, housewares, kitchenware, clothes, collectibles, furniture, desks, bikes, holiday items, mostly Christmas, glassware, and more. Bethlehem Grange 24 Bridge St., Selkirk, NY 12158.  Bridge St is Rt 396 W.  From Rt 9W, West on Rt 396W, 1/10th mi from Rt 9W, Grange Hall is on left. Proceeds of this sale are going towards much needed interior repairs and updates on the Grange Hall, which is on the National Historic Register.

Blood drive held from 8 a.m. to 1 p.m. in the Berne-Knox-Westerlo secondary school gymnasium. Visit redcross.org to sign up.

Schoharie Valley Garden Club bus trip to Cornell Botanic Gardens, Ithaca, June 7.  $50.00 includes bus tour of gardens & arboretum; time to explore main gardens & gift shop.  Lunch at Moosewood Restaurant (not included). Bring a mid-morning snack. Leaving Schoharie Park & Ride at 7 am.  For reservation call Betty Karlau (518) 295-7781 by May 14.

Native Plant Sale at Thacher Park Overlook. Saturday and Sunday. 10 a.m. to 3 p.m. Create a Living Landscape with native plants.  Native plants can solve your biggest gardening challenges. Over 40 hard to find species of perennials, shrubs and small trees for all soil and moisture types will be available. Call 872-0800 for more information.

Garden Education Day & Plant Sale. 9 a.m. to 1 p.m. An opportunity to buy plants, learn new things about gardening, and visit the demonstration gardens! CCE Albany County, 24 Martin Road, Voorheesville.

Barn Dance, with caller Paul Rosenberg and live music by Tamarack 7:30 to 10 p.m. at the Octagon Barn, 588 Middle Road in Knox. Use Delanson 12053 for GPS directions. All dances will be taught.  Partner and Non-Partner Dances. Suggested Donation Adults $5, Children $2.  Please bring a non-perishable food item or make a monetary donation to the food pantry, in honor of Jean Forti. (518) 482-9255.