Hey @pompe72! =)
This event is in the /sv world, not the /sb world, in
/sv, there is plenty of grass on the farm world at
You can dig grass and get out dirt. Either way, grass and dirt is counted the same way.
If you have farmed some dirt, just deliver it using
/deliver. But this only works once the event starts. =) With grass, I'm talking about the green dirt blocks.
If you still have questions, just tell me. ^^
We also have a Discord where you can ask: https://discord.gg/FRuK5BC