I stumbled upon this on Instagram recently. The Liberty Hotel in Beacon Hill is hosting complimentary curling each Monday and Wednesday through February in the Yard from 4PM – 8PM (weather permitting). Chronicle recently featured it on their show. You can see the clip here.
While walk-ins are welcome, you are encouraged to make reservations, which can be booked via firstname.lastname@example.org or 617-224-4004.