Long Island businesses are asking patrons to show proof of COVID-19 vaccines, as the delta variant continues to spread.

The owner of Engeman Theater in Northport, Kevin O'Neill, sent an email out to their patrons saying customers need to be fully vaccinated to enter.

A vaccination card or New York state’s Excelsior Pass are considered acceptable forms of proof.

All audience members over the age of 12 years old are required to be vaccinated.

RELATED: Mineola restaurant requiring vaccination for patrons, workers

The theater will also encourage patrons to wear masks.

"When we start having people calling up and just canceling the tickets that they've already purchased, I'm looking at refunds ... It gets to a point you have to make a decision. It's a business that we're running, and it had to be made at this point on our part," said O'Neill.

A Mineola restaurant, Black Sleep Ale House also announced that they will be requiring its customers and workers to show proof of COVID-19 vaccine.

The owner at Black Sheep Ale House says this decision is to keep everyone safe.

Editor note: An earlier version of this story stated that the theater was requiring patrons to wear masks. This has since been revised. Patrons will be encouraged to wear masks.