Mainz carnival
... that the Rosenmontag parade of the Mainz carnival had been filmed since 1910?
...  that the <a href="./Rosenmontag" id="mwAWg" rel="mw:WikiLink" title="Rosenmontag">Rosenmontag</a>  parade of the <b id="mwAWk"><a href="./Mainz_carnival" id="mwAWo" rel="mw:WikiLink" title="Mainz carnival">Mainz carnival</a></b> <i id="mwAWs">(pictured)</i> had been filmed since 1910?