When "Teen" searches for Agatha Harkness online, her last name is misspelled as Harkkness on the "brujapedia" webpage.
When the 'Teen' receives the text outside Agatha's house, it's meant to happen in real-time. However, the message shows "Last Month" above it, suggesting it was sent a month ago rather than at that moment.
Given that divination is forbidden by the Torah, it's profoundly unlikely that a palm-reading booth would be part of a Bar Mitzvah celebration.