The Little Monsters site says - "Further information on car parking coming soon."
Obviously "We would like to encourage people to use public transport as buses and trains run regularly to within 20-30 minutes’ walk (through Stanmer Park) to the lawns in front of the church....Falmer Station is...
The Festival featuring Dick and Dom, Peppa Pig and the Octonauts etc is all day Saturday June 9th >> http://littlemonstersbash.co.uk/getting-here/
Is Sheff Weds likely to move to the Friday night ? No chance it will be on Sky i suspect. (they announce their opening day fixtures at 10am)