This game will be played at Bramall Lane on Sunday 19th April with a 3:00pm kickoff. www.sheffieldeagles.com/News/Article/39243

This game will be played at Bramall Lane on Sunday 19th April with a 3:00pm kickoff. www.sheffieldeagles.com/News/Article/39243

Not much. There's a car park but i'd imagine it'll be big wigs only on the day. Bramall Lane is quite close to the city centre so you should be able to find a pay and display car park not too far away, possibly even for free on a Sunday. Easily accessible via train.

There's on street parking around the stadium as it's only controlled Monday - Saturday for permit holders in pretty most places so you should even be able to park on single yellow lines outside the control hours.
Examle places that have on street parking with no Sunday controls are; Hill Street/John Street to the West, Edmund Rd, Cherry street, Lancing Road to the East, even Countess rd, Clough Rd etc to the North have free on street parking which are within spitting distance (if you are lucky enough to find a spot)