The Fisarmonica Run starts at the Monumento Nazionale delle Marche in Castelfidardo, in Italy's Ancona province, with runners setting off at 9:00 AM in June. The main competitive option is a FIDAL and circuit race listed at 9.8 km, so it sits just under the standard 10 km distance rather than using a full 10K label.
People who do not want the competitive race can enter non-competitive 5 km or 2.5 km options, which makes the event workable for walkers, newer runners, and local families as well as club runners. Atletica Amatori Avis Castelfidardo organizes it, and entries are handled through FIDAL's Tessonline system.