A Chicago law firm helped obtain a settlement with MGM Resorts International worth up to $800 million for thousands victims and relatives affected by the 2017 mass shooting at a Las Vegas music festival.Romanucci & Blandin LLC attorneys Antonio M. Romanucci, Stephan D. Blandin and Bryce T. Hensley represented 76 individuals from 11 states and Canada — 13 of them from Illinois — in litigation against the hotel …