The official invite that Apple has recently sent out contains the headline "Let's take a field trip." and the location of the March 27 event makes it all clear. The new Apple products will be unveiled at the Lane Tech College Prep High School, the rumors about them including new iPads (models with an OLED display and/or cheaper ones), VR gear, a new Apple Pencil, and even a preview of the upcoming iOS 12 update.
https://www.notebookcheck.net/Apple-confirms-March-27-event-we-should-get-ready-for-new-iPads.289864.0.html