CTBRA is having a j/p in McGregor on Saturday afternoon. You can get an exhibition from around 10am until 1pm, then they have the youth classes.
The open 4D starts promptly at 2pm and usually there's nearly 100 in the open. $30 to run, 83% to the pot, 1/2 splits all the way across. Entries accepted until the last 25. There will also be exhibitions after the open.
Great ground, good parking and even the concession stand has good food.
If you're interested and not sure if you can or cannot make it on time, PM me and I'll give you my cell number because I'll be there all day.
Directions from Waco to McGregor -
http://www.ctbra.ebarrelracing.com/Directions%20to%20mcgregor.htm