It's from a contemporaneous reference to the very same event listed in the PDF. I found it online and archived it: https://web.archive.org/web/20260206040716/https://what2wear...

It includes screenshots of what looks like an expanded document for the event.

Why relevant? I found it by searching the archive for "DBC". There were references to "Dubin", then I found the rest online easily. All that extra text could have helped with decoding the base64 text