The phrase "to participate in the tournament" means to take part or be involved in a tournament, an event where people or teams compete against each other in a specific activity or sport. Full definition
Interesting facts about every country participating in the tournament this year, everything from flags to food to population. (tes.com)
A total of 16 youth and adult teams participated in the tournament, with players hailing from both city agencies and the local community. (thebronxchronicle.com)
They would like to use their travel money to attend a camp instead of participating in a tournament. (utahpubliceducation.org)