The phrase "to join the parade" means to participate in a popular or widely accepted activity or trend. It refers to becoming part of a group or movement that is already in progress. Full definition
Now in light of this past economic downturn, states want to join the parade of municipalities who have recently filed. (bankruptcyhome.com)
It was a bold statement, spelled out almost entirely in black and white, with yellow and orange joining the parade. (vogue.co.uk)
Mazda has plans for the new Mazda6 and CX - 5 to receive diesel engines, and rumors are swirling that the Cadillac ATS and Chrysler 300 may join the parade as well... (motorweek.org)