Should "grand opening"grand opening be singular or plural? Here's the sentenceThe sentences in question. "Celebrate the grand opening of Planet Fitness Mason and Planet Fitness Middletown for just one dollar!":
Celebrate the grand opening of Planet Fitness Mason and Planet Fitness Middletown for just one dollar!
or "Celebrate the grand openings of Planet Fitness Mason and Planet Fitness Middletown for just one dollar!"
Celebrate the grand openings of Planet Fitness Mason and Planet Fitness Middletown for just one dollar!