The producers of Billy Elliot, Elton John’s musical about a British boy who dreams of becoming a ballet dancer, have announced $25 rush tickets for every show. Previews for the Chicago engagement of the Broadway hit begin March 18 at the Ford Center for the Performing Arts Oriental Theatre, 24 W. Randolph, and the production officially opens April 11. Rush seats go on sale the day of each performance starting at 10 AM (11 AM on Sunday). Ten rush seats have been allocated for each show, and more seats may be made available. There is a limit of two rush tickets per customer. Full-price tickets range from $28 to $100, which would buy a lot of ballet lessons.