According to the Tool Hotline, two-piece rock band Tweak Bird will be supporting Tool on all the non-festival dates:

The Bird Brothers are extremely excited to announce this Independence Day that we will be touring the U.S. and parts of Canada supporting TOOL! We will be playing 13 shows over three weeks so check the tour page for all the show dates. We are sure this will be a most rad time, and when it’s all over we will pour all that professional experience into recording our first full length record. Happy Birthday America…start the van.