A September scene on Bass Beach in Rye, a popular spot for surfers. Summer and fall fill September on the SeacoastWhen summer shifts into fall, Portsmouth takes it in stride with a full calendar of fun and options to indulge in and explore.Art 'Round Town starts things off right away! Delve into the Seacoast's visual arts scene Sept. 1 during this popular gallery walk.Portsmouth Peace Treaty Day is Sept. 5Sept. 7 Ruthie Foster at Jimmy’s Sept. 8 and 9: The 34th Annual Pocket Gardens of Portsmouth Tour