Simplify the following text for a Grade 8 native English-speaking person.
Original: His first appearance as Tonio in Donizetti 's La Fille du RÃ giment took place at the Royal Opera House , Covent Garden on 2 June of that year .
Simplified: His first appearance as Tonio in Donizetti 's La fille du rÃ giment took place at Covent Garden on June 2 of that year .