Subida a La Tesla - La Marcha del Cid is a small trail-running event based in Villarcayo, in Spain’s Burgos province, with a provisional late-August slot. The programme lists short off-road races of 7 km, 6.3 km, and 4 km, and at least some entries are marked non-competitive, so the day is not only for runners chasing a result.
The name points to La Tesla and to the Marcha del Cid, but the available listing gives more practical detail than route storytelling. Runners can expect trail categories, timing, digital results, bib delivery support, and a results section once classifications are published; the page also lets people request a notification when the event is confirmed.