This is nothing to do with Pride as it's B&H Council who ultimately have the say. The organisers of Pride have just used the same weekend every year and the council have given them the go ahead to do so...
Personally, after this year, where local council tax payers (99% of whom don't even attend Pride) have had to pick up the cleaning bill, I wouldn't even bother with letting them use Brighton again.
Bollocks. You're telling me only 250 people from Brighton & Hove go to pride?