Not 100% sure but!

See point 3.2:



"3.2 The UK Awards Evening will take place on Friday 10 May 2019 at:
Warhammer Fest 2018
Ricoh Arena
Judds Lane
Coventry
CV6 6GE
United Kingdom"

So it would make sense for the Fest to be on May 11th and 12 as it's Saturday and Sunday