After several months without a contract, 600 unionized concession workers at TD Garden will vote Sunday to potentially authorize a strike. What happens if they vote yes?

Around 600 workers, from the suites to the merchandise stands, are taking a strike vote Sunday after three months of stalled contract negotiations.

Concession workers at the home of the Celtics and Bruins are slated to meet Sunday to vote for a strike authorization.

After months of contract negotiations, the union representing over 600 concessions workers at TD Garden says it may go on strike, in part because of the venue’s move toward more self-checkout kiosks.