Sorry, unpegged. EURCHF was capped at 1.20 till 15 January 2015. The CHF rose 30% when this was removed.
The major events like Brexit aren't all too common. There have been one in 2016 (Brexit), one in 2015 (CHF unpeg). arguably one in 2014 (ruble voletility, leverage limited), none in 2013 (government shutdown didn't really cause much action), none in 2012 either, a few in 2011 (like the introduction of the CHF peg).