Scratch, or Stock

Can anybody help please, this message has popped up on my screen “Scratch, or Stock - Win the race against Alejandra” What does it mean, and how can I get rid of it, as it’s annoying?

Sounds like you started the Vocho story event. I believe that’s one of the early chapters… maybe even the second one?

Thanks Ti Hsien, you were right, it was a recommended accolade from that event, have managed to switch it off, I will try to complete that later! Thanks again for quick response!