Two suggestions for parking- Either the long lot on the south side of Baujan or the lot in front of Frericks. Family weekend was last weekend and there is no volleyball match Saturday night so both lots should have plenty of spaces. Both are off Frericks Way also known as Alberta St.
As to which side of the field to sit on - I like the terrace (north side) because it is elevated and easy to watch the field strategy. Others like the grandstands on the south side because you are closer to the action - just a matter of personal preference. There will be plenty of open seats on either side. The students usually stand - and make noise - in between the two grandstands on the south side.
Concessions are on the south/grandstand side - very important with a youngster.
Restrooms are on the north side inside Frericks - aka the Fieldhouse - also very important for a youngster.
Best of all - no admission charge. Enjoy the time with your son.
Update-Weather looks to be good but a bit crisp and cool. Dress for it.