Def15 has 5 Three Days Grace concerts.

Three Days Grace is a Canadian rock band, formed under the name Groundswell in Norwood, Ontario, Canada in 1992. After a breakup in 1995, the band reformed in 1997 under its current name and with a line-up consisting of guitarist and lead vocalist Adam Gontier, drummer and backing vocalist Neil Sanderson, and bassist Brad Walst. In 2003, Barry Stock was recruited as the band's lead guitarist. The band has released seven studio albums, with a record fourteen #1 hits on Mainstream Rock.