Johnny Rockets, the 1950s diner-themed hamburger chain, which has opened a combined restaurant with the Halsted Street Deli on the corner State and Lake Streets in the Loop, will celebrate its grand opening today.

Between 11 a.m. and 3 p.m. the restaurant will be passing out samples of the chain’s classic hamburgers, wings and shakes. Every 15 minutes, guests can also participate in a raffle to win coupons, for a free shake with purchase a hamburger, and Johnny Rockets gift cards. An official ribbon-cutting ceremony will be held at 4 p.m.

This is the second, co-branded downtown location for Johnny Rockets since the start of summer. The chain opened a location at 30 N. LaSalle over Memorial Day weekend.

Johnny Rockets, a Lake Forest, Calif.-based chain, was established in 1986, and now has 292 company and franchise-owned restaurants in 32 states, as well as Washington, D.C. and Puerto Rico, as well as 15 countries.