(collective) A company of riders.
A parade.
A trail ride, usually more than one day long.
(by extension) A series, a chain (e.g. of events).
As soon as I visited this website, a cavalcade of dialog boxes started to appear on my screen; that's when I realized my computer was infected with a virus.
To move as part of a series or group, such as marchers in a parade or snow in an avalanche, especially in large numbers or in a chaotic or dangerous fashion