https://www.reuters.com/article/us-telecoms-mobileworld/despite-smaller-scale-barcelona-relieved-at-return-of-telecoms-gathering-idUSKCN2E11SN

Barcelona recalls the cancellation of the Mobile World Congress (MWC) in February 2020 as the first sign that COVID-19 was a real, immediate cause for concern - a month before most of the world locked down.