You have the right idea - avoid using the team's logos and trademarks (and team colors, and other "trade dress" indicia" that could mislead consumers about whether your app is affiliated with or endorsed by them). Yes., facts like when and where and who a team is playing, are unprotectible facts, and no one owns them, so you can create an app with that information. You can't just link to an existing source that's already created a schedule, likee the team's own website, however.
So same goes with the app name. Using the team's city with their name may indeed confuse their fans/consumers and get you a "cease and desist" or letter or a lawsuit. Unless you have a way to add a prominent disclaimer about your app's lack of affiliation with the pro team, you'd be committing trademark infringement. Yes, find another app name, and hire a trademark lawyer to register it, as well as a patent lawyer to patent the invention itself.
Avvo doesn't pay us for these responses, and I'm not your lawyer just because I answer this question or respond to any follow-up comments. If you want to hire me, please contact me. Otherwise, please don't expect a further response. We need an actual written agreement to form an attorney-client relationship. I'm only licensed in CA and you shouldn't rely on this answer, since each state has different laws, each situation is fact specific, and it's impossible to evaluate a legal problem without a comprehensive consultation and review of all the facts and documents at issue.
Ms. Koslyn is correct.
The main concern is Trademark infringement, and if you research "likelihood of confusion" you will find some simple definitions to give you some guidance.
My disclaimer is simply that Avvo already has an adequate disclaimer.
Yes. But that's not the question. The question is will you be likely to have legal problems if you do.
You can give the app the name "Pete's game finder" [substitute your real name] rather than "The Dallas Cowboy game finder." Pete is not the Dallas Cowboys, and it is confusing to say otherwise and confusion will get you into trouble. Quick, what would you do if you were the attorney responsible for protecting the servicemark THE DALLAS COWBOYS from use by person's not affiliated with or licensed by the NFL or the team? And remember, your management can replace you at any time if they think you are letting people like Pete slide by. See, you SHOULD be worried. If you want to NOT be worried, hire a trademark attorney and let the trademark attorney solve your worries and turn them into solutions and things YOU can protect so that other people have to worry about YOU, not you about them. Think how much that would be worth to you and you will know what to do. Since your app would be nationwide, even international, in use you can use a good IP lawyer or Internet lawyer anywhere in the US.
I am not your lawyer and you are not my client. Free advice here is without recourse and any reliance thereupon is at your sole risk. This is done without compensation as a free public service. I am licensed in IL, MO, TX and I am a Reg. Pat. Atty. so advice in any other jurisdiction is strictly general advice and should be confirmed with an attorney licensed in that jurisdiction.
The First Amendment as interpreted by case law gives you the right to report on facts such as where and when sports teams are playing. But you cannot suggest any association of your app with sports leagues or teams---thus you would need to use a generic title rather than use the name of a specific team or league (i.e., pro football game finder).
Your question does not raise the most important issue here---whether this application can be developed and practice without violating patent law. You need counsel to provide a patent clearance analysis because there are literally hundreds of potentially applicable patents. Even if you solve the trademark and copyright law problems, you still have to make sure your application does not infringe third party patents.