More than 50 organizations representing day and overnight summer camps will be on hand for the 31st annual Concord-Carlisle Summer Opportunities Fair, taking place from 5:30 to 8 p.m. Monday at Concord-Carlisle Regional High School. Parents and students from all neighboring communities are encouraged to attend. The snow date will be Tuesday. For more information, e-mail cchssummeropps@gmail.com.