Police called to IKEA after thousands sign up for hide and seek (2019)
scotsman.com
scotsman.com
Something similar from 2009 too:
https://news.ycombinator.com/item?id=508189
https://web.archive.org/web/20090312000304/http://dornob.com...
https://www.bloomberg.com/news/articles/2015-03-16/ikea-stam...
https://www.fastcompany.com/90399077/ikea-politely-asks-that...
https://nypost.com/2019/09/11/cops-shut-down-massive-3000-pe...