PRP has rescheduled Saturdays TNT to Sunday due to the weather report.

From their site:

We do not want to cancel this weeks Test N Tune, so in anticipation of Saturday's weather repot, we are moving the Test N Tune to this Sunday April 29.
Gates will open at 9am, TNT will be from 11-5. There will NOT be a gamblers race so that we can focus on getting as many Test N Tune runs as possible.
Thanks for your understanding. We want to race as bad as you do.
***The chassis certifications will still be on Saturday April 28, RAIN or SHINE.***