The Azeri Bila Herri Lasterketa is a 10K road race held in Hernani, a town in Gipuzkoa, Spain’s Basque Country. The race takes place in June, typically starting in the early evening around 18:00. C.D. Hernani is the organizing body.
The event appears to be a well-established local Basque running race, not a large city marathon. It has been run at least 23 times over the standard 10K distance. Recent registration details show an entry fee of 15 euros, with sign-ups opening in spring and closing just before the race.