Sports Authority, a sporting goods retailer with about 470 stores nationwide, said it has scheduled grand re-opening festivities for two of its Massachusetts stores that have been closed for remodeling.

A Sports Authority at Liberty Tree Mall in Danvers has been relocated to a slightly smaller, but more visible space within the mall, the company said. Converted into the chain’s new format, that store will feature Nike and Under Armour mini shops as well as a simplified layout, brighter lighting, and bold colors, the Colorado-based chain said.

The first 250 customers at the store will receive “Mystery Bucks” that range from $5 to $500 in value --- doors are set to open at 8 a.m. --- and former New England Patriots star Ben Coates is scheduled to put in an appearance around 1 p.m. Saturday, the chain said.

A Sports Authority store in Braintree also has gotten a make-over, though it remains in its existing location.

The chain has similar plans for the Braintree re-opening. Doors are set to open at 8 a.m. Saturday. Early-bird customers will win “Mystery Bucks.” And former Red Sox pitcher Jim Lonborg is booked to show up at 1 p.m, the chain said.

Sports Authority has 13 stores in Massachusetts.