Planing to go to Finland. But where to go? And where to stay?

I'm planing to go to Finland this summer, does anybody know a good place where a lot good concerts take place?

I thought it would be very nice to spend time with other metal lovers and have some fun and stuff, I really want to meet new people

And if someone may have a free room this summer where I may can stay for 1,2 or 3 weeks between 12. july and 12. august 2014 ... please write me!  

happy for any comments    \m/