Sentence:  For the second year, foreign amateur runners were allowed to <WSD>participate</WSD> in a 10-kilometer race, a half-marathon or a full marathon in Pyongyang, the capital. The races were a part of the April 15 birthday celebration of Kim Il-sung, the former leader of North Korea and father of his successors: Kim Jong-il, a son, and Kim Jong-un, a grandson. 
Meaning of the word marked with <WSD> tags:  To join in, to take part, to involve oneself ((in) something). (from 16th c.)