Sorry you had problems finding necessary info for Sprint Week. Be advised that Terre Haute now hosts only six racing events per year and that includes one Mod/LM only and one Champ car show. The operators are far removed from the operation except for those few dates. That may be a precursor of things to come as to the best of my knowledge only one Indiana sprint car track now runs every week of the normal season and at least one of their events is minus sprint cars. The others are showing holes in their schedules along with shorter schedules. Anyway, the tickets are $25 (less $5 for Hoosier Auto Racing Fans Members) To the best of my knowledge there are no reserved seats other than handicapped but they have a ton of seating (boards, you might want a cushion) and you can see about the same from everywhere. The main grandstand is covered. Good latrines and close to Fair food. You can carry about anything in (including alcohol). Plenty of RV parking. Some with w/e hookups ($) (might want to call Fairgrounds ahead for hookup sites). The Sprint Week race occurs during the Vigo County Fair and the track is within the fairgrounds so you may have to park some distance from the track. As mentioned, if you arrive after 4PM they have a charge for parking (this race only. not sure if its $4 or$5) Be patient when leaving. Lots of traffic.
Hot laps are normally at 6:30 with racing at 7:30 (maybe 8) Track is located about a mile south of I-70 on US41 on west side of highway.
Congested area. If I'm wrong on any of this I'm sure someone will correct me.