Jim, "The Belfast riots were a response to the ongoing provocation that takes place this time every year"

Wrong Jim.
From my BBC link above,"The phrase 'recreational rioting' was made in Belfast, to describe the traditional outbreak of street disturbances once the summer school holidays begin."

Bored school children, and dissidents fomenting violence for their own purposes. Nothing to do with a parade.
Thousands of parades and that was the only trouble.
Even the huge Apprentice Boys march in Derry passed off peacefully.