Table:
text: Head of the River (Queensland)
Participating Schools
Winning Head of the River Championship Events
School Location_ Enrolment Founded Denomination Day_Boarding School_Colours Abbreviation In_competition_since
St Margaret`s Anglican Girls` School Ascot 900 1895 Anglican Day & Boarding Navy Blue, White & Brown STM 1990
St Peter`s Lutheran College Indooroopilly 2000 1945 Lutheran Day & Boarding Maroon & White SPLC 1990
Stuartholme School Toowong 700 1920 Catholic Day & Boarding Red, Gold & Blue STU 1991

Question: What was the name of the River Championship events, the names of the participating schools and Head of the River (state or territory in Queensland), when was splc formed?