When a booker changes a gig, Gixtra notifies the people affected by that change by default.
Participants receive a summary of the changes and a link back to the gig.
If you do not want to send a notification for a change, save the gig as a draft while it is still unannounced.
If you add someone to a gig, Gixtra notifies them. If you remove someone from a gig, Gixtra notifies them that they were removed. After that, they no longer receive updates about later changes to that gig.