Shutter Speed

 Picture taken with fast shutter speed

Picture taken with slow shutter speed

At the beginning while the sun is still partially up and the courtyard has reasonable light
a.) the dunking booth-1/2000
b.) the food eating contest-1/1000
c.) the rock climbing wall-1/250
d.) someone working at a booth-1/250
e.) the DJ/MC working at the middle of the circle-1/125
f.) the Diamonds performance-1/4000

Towards the end when there is no sun and has gotten dark enough that you can't see from one end of the courtyard to the other
a.) the dunking booth-1/1000
b.) the food eating contest-1/500
c.) the rock climbing wall-1/125
d.) someone working at a booth-1/125
e.) the DJ/MC working at the middle of the circle-1/125
f.) the Diamonds performance-1/2000

Three mode: Auto, Shutter Priority, and Manual.
Auto mode automatically sets the shutter. Shutter Priority and Manual let you set the shutter manually but for Shutter Priority, the aperture is on auto mode.

Canon Rebel T3 has the following settings for shutter speed:
BULB, 30", 25", 20", 15", 13", 10", 8", 6", 5", 4", 3"2, 2"5, 2", 1"6, 1"3, 1", 0"8, 0"6, 0"5, 0"4, 0"3, 1/4, 1/5, 1/6, 1/8, 1/10, 1/13, 1/15,1/20, 1/25, 1/30, 1/40, 1/50, 1/60, 1/80, 1/100,1/125, 1/160, 1/200, 1/250, 1/320, 1/400, 1/500, 1/640, 1/800, 1/1000, 1/1250, 1/1600, 1/2000, 1/250, 1/3200, and 1/4000 .