To quote NLM about the event:
The St. Louis Chapter of the Latin Liturgy Association is pleased to welcome liturgist Bishop Peter Elliot to St. Louis Saturday and Sunday, September 29th & 30th, 2012 for a public lecture and Holy Mass at Historic St. Mary of Victories Chapel downtown. His Excellency is an international authority on liturgy, and on the Anglican Ordinariates now authorized by Pope Benedict XVI. The public is invited; free of charge.
The lecture is titled “ Benedict XVI and the Liturgy: Vision and Practice” and will take place Saturday evening, September 29th at 7:30 PM.
Bishop Elliot will celebrate Holy Mass in the Ordinary Form in Latin at 9 AM on Sunday, September 30th.
Both will take place at historic St. Mary of Victories Chapel 744 South 3rd Street, in downtown St. Louis ( Map & Directions).