Lifestyle

Learn how to conserve water and protect the environment. Tour Upper Trinity’s Water-Wise Demonstration Garden, visit educational booths and get to know your sprinkler system. The garden and booths will be open 9 a.m. to noon. A “Get to Know Your Sprinkler System” class will be offered 10 a.m. to 11 a.m. Registration for the class is required. Contact: Erin Blackman, eblackman@utrwd.com. Sponsored by the Upper Trinity Regional Water District, City of Lewisville and KeepLewisville Beautiful. Free.

This happy hour will be our second meetup of the year. Your first round of drinks is on Green Source DFW and there'll also be appetizers and other light snacks. See link to RSVP.

Learn the basics of rainwater harvesting and the benefits it can provide to a residential property.  See a demonstration on building a 50-gallon rain barrel. Material parts list to build your own barrel will be provided. Register: Dustan Compton, 817-459-6628 or dustan.compton@arlingtontx.gov. Free.

Oak Cliff Earth Day this Saturday features vendors, artists, speakers, yoga and the Pooch Smooch dog kissing booth. Free.

Meet fellow vegan and veg-friendly folks for a great evening of drinks, fun and discussion on vegan goings-on in the Metroplex.

The Solar Car Challenge is designed to motivate students in science, engineering and alternative energy. Students learn how to design, engineer, build and race roadworthy solar cars. The 2013 event features a cross country trip from Dallas to LA beginning July 23. 

On Sunday and Monday, observe the teams as race judges perform final "scrutineering."

Identify yourself with the guard at the South Gate at the Texas Motor Speedway. The TMS entrance is off of SH 114 just west of I35W. Designated parking areas for guests will be identified in the infield area. 

Expo presented by the city of Bedford featuring vendors and exhibitors from energy-saving retailers and renewable energy providers, along with natural gas and other alternatives. Free. 

Star parties are being held at three locations in Tarrant County to bring attention to light pollution: The Tandy Hills Natural Area in Fort Worth (http://tandyhills.org), the Fort Worth Prairie Park (https://www.facebook.com/savetheprairie) and the Bob Jones Nature Center in Southlake  (http://www.bjnc.org). Participants will observe the sky and upload their observations. The event is part of an international citizen scientist program (GlobeAtNight.org). See GSDFW story: http://greensourcedfw.org/articles/julie-s-green-light-april-8-video-race-goes-green-earth-day-film-bash-regional-star-party

Hosted by the North Texas Electric Auto Association and AutoNation. Organizers are expecting more than 50 Leafs there this year. Leaf owners and nonowners welcome.