Rangely’s “The Tank,” now the International Center for Sonic Arts, will welcome the public to open hours over Septemberfest (Labor Day) weekend. To schedule an individual or group session on Sunday or Monday, contact Heather Zadra at 629-9937. This weekend: Saturday, join musicians and sound artists at the Tank from 9 to 11 a.m. to see how the space transforms sound into something all its own; Sunday, individual/group sessions and from 7 to 9 p.m.,…