Facebook is rolling out a new Pages experience: learn more.
At this time, the new Pages experience does not yet support the installation of Pages Tabs: if your Facebook Page has already been switched to the new Pages experience, we are currently unable to install the Bandsintown Live Shows tab.
You can still post directly to Facebook through Bandsintown by toggling On the Facebook Connect setting in Bandsintown for Artists. More information about this here.
In order to encourage Facebook to prioritize the support for Page Tabs in the new Pages experience, you can submit a request here.