Event organisers need to share calendar events that work across every calendar app, Apple, Google, Outlook, without attendees keying in the details by hand.
A PWA that turns event details into a QR code containing the full event in ICS format. Download the QR to share, or the ICS to add directly, install it to a phone home screen, and it works offline.
A small, installable app that solved one specific annoyance and then stayed solved.
Tracking down a PWA URL-resolution bug, where the homescreen shortcut resolved to the domain root instead of the GitHub Pages subdirectory, taught me to read a manifest's start_url and scope carefully. Good root-cause practice.
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