Atlanta's Mastodon have canceled dates on their previously announced tour of Europe, as well as their appearance at Heavy Montreal Fest on Aug. 3. Citing "personal family matters," the band has announced that shows through Sep. 3 (Athens, Greece) will not take place. A show scheduled for Sep. 5 in Iceland has been rescheduled to Dec. 5. You can click below to see the affected dates.

The band released Once More ’Round The Sun last year.

Aug. 07Montreal, QCHeavy Montreal Fest
Aug. 12Oslo, NorwayOya Festival
Aug. 14Dinkelsbühl, GermanySummer Breeze Fest
Aug. 15Hamburg, GermanyElb Riot Festival
Aug. 16Dornbirn, AustriaBregenz Conrad Sohm
Aug. 18Cologne, GermanyEssigfabrik
Aug. 19Berlin, GermanyKesselhaus
Aug. 20Charleville Mezieres, FranceCabaret Vert
Aug. 21Hasselt, BelgiumPukkelpop Shelter Marquee
Aug. 25St. Petersburg, RussiaSKK Arena (w/ Metallica)
Aug. 27Moscow, RussiaOlympysky (w/ Metallica)
Aug. 29Reading, UKReading Festival (The Pit Stage)
Aug. 30Leeds, UKLeeds Festival (The Pit Stage)
Aug. 31Istanbul, Turkey100% Metal Headbangers
Sep. 02Thessaloniki, GreecePrincipal Theater Club
Sep. 03Athens, GreeceGazi Hall Entertainment Stage