Determine the valence intensity of the following tweet, considering the mental state of the author. Assign a real number between 0 and 1, where 0 denotes extremely negative and 1 denotes extremely positive.
Tweet: Evening all. Don't forget it's #RobinHoodHour TONIGHT 🏹\n\n#bizitalk #bizhour #southyorkshire #MansfieldHour #chirp #sheffieldHour #NottsHour
0.534