What have you tried Katrina? There is no tutorial that shows how to do exactly what you want to do.
Here are some examples showing how to use NFC tags with App Inventor 2
https://www.google.com/search?q=app+inventor+nfc&oq=app+inventor+nfc&aqs=chrome..69i57.4911j0j7&sourceid=chrome&ie=UTF-8
That should get you started. These resources, perhaps should help you finish and help you learn to use the AI2 tools A very good way to learn App Inventor is to read the free Inventor's Manual here in the AI2 free online eBook
http://www.appinventor.org/book2 ... the links are at the bottom of the Web page. The book 'teaches' users how to program with AI2 blocks.
To help you program the " if it is Tuesday, then bring pencils" part, specifically review
Try some Blocks, if you have a specific question or run into issues, post again here in the Forum and someone will probably provide advice.
Regards,
Steve