Rachel, basically you need to get to the Haymarket Metro/Newcastle Uni/RVI area of Ncle.
I think the easiest route to describe is up the A1 (as if heading to the MetroCentre), past the Angel as far as the A184 junction for Gateshead/Newcastle. Keep on that road and go across the Redheugh Bridge and go all the way up (St James' Boulevard) as though you were going to the football ground (cannot miss it).
At the very top (at St James' Park) go right at the r'bout down to Percy Street and turn left. You then go all the way along there past the bus station till you get just past the Haymarket Metro.
Turn left up Claremont Road (next to Uni and Hancock Museum) and Exhibition Park is on the next r'bout. There's a car park there I think. I'll email you a link I found which shows a map of the area. I'm not entirely sure where you go to find race HQ but I'm sure there'll be others around.