Bespoke Events and Variables serve exactly the same purpose as Simconnect Events & Variables except you create them yourself by using the Detective functionality within the GoFlight Interface Tool.
Why use Bespoke Events & Variables?
Many complex aircraft use custom developed code and gauges which cannot be accessed using Simconnect Events and Variables. However by using Detective you can reveal normally hidden internal variables and events and then include these in your own Bespoke Event allowing your flight sim hardware to work with custom developed code and gauges.
The normally hidden internal variables are referred to as Lvars or Local Variables.