Thousands of Catholic Hoosiers are expected to flood Lucas Oil Stadium today for a ceremonial mass in honor of Archdiocese of Indianapolis’ 175th Anniversary.

The mass begins at 3 p.m. and is open to the public.Indianapolis Archbishop Daniel M. Buechlein and 19 other Catholic dignitaries from across the United States are expected to attend.

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The church believes this could be one of the largest assemblies of Catholics in state history.According to spokesman Greg Otolski, the Archdiocese of Indianapolis was formed as the Diocese of Vincennes in 1834. The Diocese was moved to Indianapolis in 1898 and became an Archdiocese in 1944.Otolski estimated there are more than 227,000 Catholics in 151 parishes in 39 counties in central and southern Indiana.