A mariachi band turns a party into an event, and booking one is where a lot of hosts get burned. You call a number a relative gave you, you are quoted a price that may or may not be real, and you send a deposit on trust to a group you have never seen perform. Then on the day you are hoping the right number of players actually arrive, on time, for the set you thought you paid for. The celebration was set; the booking was a gamble.
The deeper problem is that an informal mariachi booking has no clear scope and no protection. Pricing depends on how many players and how long they play, but those details are often vague, and the deposit goes into a channel with no recourse if the group shows up short, late, or not at all. For a once-in-a-while celebration, that is real money and real disappointment on the line.
So the question is not whether you can book a great mariachi band. You can. It is how to match the group size and set length to your party, agree the price and song list clearly, and secure the booking so the band you paid for is the band that arrives.

