It’s the CQWW DX CW contest using CW only on the 1.8 to 28MHz contest bands, the exchange is serial number, signal report and CQ Zone, which for the UK is 14.
The start of the UK Six Metre Group Winter Marathon It’s not a contest, just an invitation to work as many people as possible on the 50MHz band using any mode the exchange is signal report plus locator
The ARRL 160m CW contest using CW only on the 160m band, the exchange is signal report, serial number and locator. W and VE stations also send their ARRL or RAC section info.
Using the Pluto and Raspberry Pi 4 for Amateur TV and Narrowband use . Presentation given bu Noel Matthews G8GTZ Tonight @ 8 webinars are live-streamed for free on our YouTube channel and special BATC channel, allowing you to watch the presentations and ask questions online.
The ARRL 10m contest runs .Using CW and phone, the exchange is signal report and serial number, with US and Canadian stations also sending their State or Province code
DARC Christmas Contest, Using CW and SSB on the 3.5 and 7MHz bands, the exchange is signal report and serial number. German stations also send DOK or NM.