Organizers of the Race Around Waltham Series, which covers local charitable running races, will hold the Prospect Bandit Run 5K at 2 p.m. on Sept. 6. The scenic route takes runners on a tour of Prospect Hill Park, with half of the 3.1-mile course on paved road and the other half on trails. The first 200 people to register will receive a free T-shirt. Registration in advance costs $25 for adults and $15 for ages 17 and younger, and groups of four registering together will also get a discount; the fee goes up by $5 on Sept. 5 and 6. The proceeds will benefit the Waltham Track Club and Race Around Waltham. For more information, visit www.rawseries.weebly.com.