Sometimes people need to get up to speed on a secret mission or plan quickly, it's a fact of life. One would probably expect them to whisper or duck into a broom closet, restroom, or office to discuss said information, to prevent their enemies or mark from overhearing them. Sadly, some people just stand around out in the open, while speaking at or above their normal speaking volume, and the question of the enemy/mark catching wind of the mission/plan never comes up. AT ALL!
Also happens in settings involving The Masquerade. In order to keep Muggles from catching on to, say, the fact that dragons fill the sky every spring and fall, you'd expect that the people in the know would only talk about them behind closed doors, not in the middle of Trafalgar Square or on The Washington Mall. Can sometimes result in a Broken Masquerade depending on the circumstances.
Can be justified if the secret in question is an Open Secret. Usually isn't Lamp Shaded at all. Contrast Overt Rendezvous, Public Secret Message, and Easily Overheard Conversation.
When the courier brings the photographs in Spies Like Us, he announces himself quite loudly. The frustrated recipient lampshades this immediately, snarking, "Could you say that a little louder? We could open a window, and you could shout it towards Moscow."
Casino Royale: After making contact with Mathis, Bond and Vesper proceed to discuss their secret mission in a café just off the town square. Mathis also brings up blackmailing Royale's chief of police, with none of the other patrons noticing any of it.
The 1979 film The In Laws, CIA Agent Vincent Ricardo and Dentist Sheldon "Shelly" Kornpett (played by Peter Falk and Alan Arkin respectively), are conversing about the situation that they are in while dining at a restaurant. Shelly is not the least bit happy to have been dragged into this adventure and expresses his displeasure in the loudest possible manner which attracts the attention of its patrons.
In Jurassic Park Dennis Nedry and Lew Dodgson discuss the plan to steal dinosaur embryos from InGen in a Costa Rican restaurant. Dodgson even demonstrates the functions of the shaving cream can used to smuggle the embryos there while sitting at the table. Nedry lampshades their Overt Rendezvous, believing that Hidden in Plain Sight is in full effect here:
In Munich, two Israeli agents discuss the workings of their terrorist hunting operation on a crowded street, passing dozens of potential witnesses while only talking at slightly below normal speaking volume.
Harry Potter. Double Subverted in Harry Potter and the Order of the Phoenix when Harry, Hermione and Ron decide to avoid this trope by not discussing their plan in the village pub where all the students go. Instead, they go to the (nearly deserted) local Bad-Guy Bar (owned, or at least tended, amusingly enough, by Prof. Dumbledore's younger brother) where, as Sirius later tells them, they were more likely to be overheard.
How NOT to Write a Novel strongly discourages this in the section called "Don't Mind Us", using a passage where a couple loudly argues about the husband's sexual life and neo-Nazism during a town hall meeting as an example.
Happens all the time on Chuck, especially in the early seasons. Chuck, Sarah, Casey, and Morgan routinely discuss the secret mission du jour on the Buy More's sales floor. None of the characters in the know (including the folks back in Langley and Arlington) see any problem with this approach.
Happens a lot in the third season of Dexter when the DA repeatedly discusses murdering people with Dexter in restaurants, at parties, over the phone, in the office, and pretty much everywhere. Yet no one ever overhears, nor do the characters seem to be concerned that anyone will hear them. Because having the characters go somewhere private every time they need to move the plot forward would take too much screen time.
Max would often call CONTROL Headquarters on his shoe phone and openly discuss mission details in plain sight of dozens, if not hundreds, of onlookers. One episode even had Max use a phone that was hidden in a fire hydrant, while people passed him on the street.
The special agents in Threshold would often publicly discuss the secret alien invasion they are investigating. In one instance, they interview a witness while pretending to be looking for terrorists... and then turn their back and immediately start talking about alien viruses and whatnot.
Buffy the Vampire Slayer made a lot of nods early on toward maintaining the masquerade for the muggles' benefit, but that fell by the wayside somewhere in the third season. From there on out, they would just talk about whatever wherever they happened to be.
Angel: In a season 5 episode where Lorne hosts a party, he invites the senior partners, who set a trap for Angel. They discuss the trap and the plan to kill everyone at the party, while standing next to the dance floor.
Occurs from time to time in Burn Notice, including one scene in season 2 where Michael and Victor discuss the former's next job while playing speed chess in a park in the middle of the day.
The genre-blind titular characters of Pretty Little Liars discuss dangerous secrets, the goings and comings of A, and all the rest of their business in the open more than once. For example, in episode 23 of the fourth season, the Emily shouts with Paige about Allison, who is supposed to be dead, in the girls bathroom. This behavior repeatedly leads to the girls getting more trouble from A.
Happens on Supernatural since they'll casually discuss whatever monster/ghost/demon their current hunt involves in the middle of diners with normal people just sitting around having a meal.
Sesame Street plays with this in an older insert from The Seventies, in which Herry tells Grover a secret (basically, the alphabet), and tells him not to tell anybody, so Grover says he won't. Cue a montage of Grover telling a monster named Pamela, Pamela telling another monster named Fenwick, Fenwick telling yet another monster named Rosemary, until they all join in a group reciting of the alphabet, just as Herry walks by; Herry walks over and remarks, "You're very good at reciting the alphabet, Grover. But you're lousy at keeping secrets!"
Exaggerated in SPYFox. Not only does Spy Fox discuss secret plans on his spy watch out in the open, but he also refers to himself as a spy to incidental characters on the street.
You see this in almost every role-playing video game whose world includes a "Thieves Guild" or something similar. Instead of remaining cagey and guarded until they're sure someone can be trusted, members of the Guild walk right up to your avatar and announce that they're thieves, and by the way they have a guild full of fellow thieves; would you like to come to their hideout for tea?
The Booth at the End plays off of this trope. The Man at the Booth discusses lucrative, dangerous, and questionable information with visitors who come to see him at his Booth. There are always some other customers in the diners that he appears at, yet he seems not to mind, or care. This leads to a waitress asking about his "business." And then the Man gets a new friend...
In Code Lyoko, the heroes regularly discuss X.A.N.A's activities. This has gotten them into a trouble a couple times, but because their super computer has Return To The Past functionality, they're able to undo anyone finding out too much.
Five hats means that five tropers think it is ready to publish.
You are saying that you think this draft is ready to be published. That means the description is not ambiguous,
it doesn't duplicate an existing trope, there are at least three examples, and the title makes sense.
Is that what you meant to do?
You are saying this draft has a ready-to-publish hat it does not deserve and you are taking it back.