T.H.O.R. is a non-profit 5K race benefiting Women's Refuge and area first responders.
It's sponsored by the Leadership Wichita Falls Class of 2011.
Race day is Sat, March 31.
But this weekend, you have the chance to register before entry fees increase.
From noon until 4 Saturday, you can register for the run at Jerry's Sporting Goods, Academy Sports and Outdoors, and Sikes Senter Mall.
The cost is $40.
It will increase to $50 Sunday.
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