Wednesday

Trail Running, 5 p.m. in Jefferson

A summer trail training series is taking place at Hidden Valley Nature Center every Wednesday until Sept. 16. Runners of all levels can sign up for this casual series. Start your run anytime between 5 and 6 p.m. as volunteers time your progress around a course ranging from 5.5 to 10 miles. The courses will cover sections of the nature center’s annual Race Through the Woods half-marathon race held in the fall. This series is a great way to get to know the trails and a way to get an edge for the Race Through the Woods. To learn more go to hvnc.org/trailtraining, email info@hvnc.org, or call 200-8840.

Thursday

Camo Hike, 9 a.m. in Bridgton

Join the Maine Lake Science Center for a walk for all ages through the town woods looking for hidden objects on the trails. Test your powers of observation in this family activity. A $5 donation is requested from those who are not members of the Lakes Environmental Association. To register contact Mary Jewett at 647-8580 or mary@leamaine.org. To learn more, go to mainelakes.org.

Aug. 13-15

Saltwater Tournament, South Portland

The Casco Bay Classic Sportfishing Tournament will take place at Spring Point Marina for the 10th year next weekend. Proceeds will go to the Muscular Dystrophy Association of Maine, the Portland Firefighters Children’s Burn Foundation and the University of New England. The three-day tournament will feature competition fishing for tuna and sharks, and many boats will carry student researchers from the University of New England, who will assist in tagging and releasing fish for research. There will be small-game and junior divisions. All fishing will adhere to the International Game Fish Association rules, as well as state and federal laws. To learn more go to cascobayclassic.org.

Calendar items can be sent to dfleming@pressherald.com.