Connect with booking agents, control what they can do, and understand what puts a gig on your calendar.
Booking works in both directions, and the two halves are priced differently. Being approached is free: connecting with an agent or venue, and taking a date they offer you, works on any plan — the room reaching out is the one paying. Going looking is Pro: advertising the dates you want filled, and browsing venues to ask for their open nights.
Nothing happens between a band and an agent until there is an approved connection. Either side can ask; the other side approves. You can see and end your connections from the band's Booking page.
This is the setting worth understanding. When a connection is approved, it carries a slot-requests permission. With it switched on, a venue manager can book your band into one of their dates, and that writes a confirmed gig straight onto your calendar.
If a confirmed gig appears that you did not enter, it came from a venue or agent you are connected to with slot requests enabled. The gig names where it came from, and turning that permission off stops it happening again.