Is there a restaurant here to eat?

No. But there are some up & down the street

Gullerson's Grubbery is a 5-minute walk along the scenic Fox River riverwalk. Better yet, directly north of Gullerson's is 6-hour free parking, plenty of time to grab a bite to eat and see the show.

Gillerson's Grubbery is one street North and just west of the Casino. It I'd a short walk to the Paramount Theater

Try Two Brother's Round House. Less than 5 minutes away by car and they are sensitive to having tickets for a show.