Musical Artists: Specify your events to Google - Webmaster-Tools-Hilfe
"For your concert dates to appear in such a manner, you must have the
info available on your official site using structured data markup. It
sounds painful but even if you've never heard of such a thing you may
already be using tools from sites like Bandsintown, Songkick, BandPage
and ReverbNation that will take care of your end of the lifting."