[WordPress Plugin] Opt-in or Opt-out option

Hi, we've come across the case of a WordPress application that hosts events for many locations (porpalestina.org) so the current state of the plugin is not useful in this case as we only want the events of madrid to be sent to mad.convoca.la. We thought some solutions: - Have a checkbox that the user can use on the events they want to publish on a gancio instance - Select tags or locations that are sent to a gancio instance - Support many gancio instances