The dates in the captured notice
The old page listed Tulldagen events in Gothenburg on 7 October 2015, Malmö on 8 October 2015 and Stockholm on 13 October 2015. It framed the programme around international trade, customs and transport. The notice’s publication label was 23 June 2015, while the surviving archive capture is from April 2017.
These dates serve different purposes: announcement, event and preservation. Keeping them separate avoids making the archived page look like a current invitation. Its registration details, prices and personal contacts are not live offers in this edition.