Collocations for championship - noun

major
international, national, regional, state, world
British, European, US, etc.
club, conference, division, league, team
junior
basketball, swimming, tennis, etc.
back-to-back (AmE)

hold, host
The championships are to be held in Rome.

compete in, take part in
Over thirty children will compete in the swimming championships.

win
She has won four major championships in the last five years.

lose

take place

bout, fight, final, game, match (esp. BrE), race, round
competition, event, meet (AmE), tournament
contender
title, winner
run (AmE)
During the team's championship run last season, he played in 22 games.

season, series (both AmE)
squad, team
calibre/caliber (AmE)
belt, ring (AmE), trophy

at a/the championship
I saw him play at last year's tennis championship.

in a/the championship
the teams in the championship

hold
Who holds the championship at the moment?

capture, claim, clinch, earn, take, win
He's won the championship for the third time in a row.

lose
defend
regain
retain
She managed to retain the championship.

celebrate
The Red Sox celebrated their championship with an extraordinary four-hour parade.