Today, Sat 24 Oct, the UNESCO World Heritage Site Grimeton Radio Station in Sweden will start up and transmit a message on VLF.
Start up and tuning of the frankly huge Alexanderson alternator will start at 1430UTC. They will then transmit a message from SAQ on 17.2kHz CW at 1500UTC.
Thanks to the wonders of modern technology, you can watch it all live on YouTube:
I remember being impressed and intrigued by the 6 massive antenna masts that are visible from the motorway as a kid, so I really enjoyed watching the live cover of their Alexanderson Day transmission in July this year. All part of what made me follow up on finally getting an amateur licence.