Sean O'Brien 100K/50M/50K/26.2/30K

The Sean O'Brien 100k Endurance Race is an annual event that takes place in Malibu, California. It is a 100-kilometer (62-mile) endurance race that takes place on the beautiful trails of the Santa Monica Mountains. The race is known for its challenging terrain and breathtaking views, and it attracts runners from all over the world. The race is named after Sean O'Brien, a local runner and trail-running enthusiast who passed away in 2009. The event serves as a memorial to him and raises money for various charitable causes. The race usually held on the last weekend of January or first weekend of February every year.