First things first, you need to establish who you are, so you don't have people looking at you and trying to kick you out, and so you can have court side access at sporting events. In school, the staff all knew me and it wasn't a big deal but for everyone else in yearbook on the photography team (including my self) I made up badges that say "Yearbook Photographer" and then their name, that might be a bit overkill if you a parent but if your in a media club like SnS it would be a very good idea.
Next is scouting, when pros shoot anything they always scout first and have a general plan, where will we shoot? what are the good angles? and so on. Say its in a gym, go look around, talk to who's organizing it, know where people will be sitting and further formulate your plan from there always running it by some one to make sure its okay.
Court side shot
One bit of advice I wish I had is use a flash and if you have one it would be better to use an off camera or a more powerful, the flash on your camera has a very limited range.
when at events take pictures of whats in the event pamphlets, signs, sporting equipment, as well as scenery. The images might be used in making signs or advertisements or just as fill images in yearbooks, newsletters and such.
Take photos from odd angles and with odd composure. These photos can be used much the same was as "bumper" images can.
Bring a tripod
You might think you won't use your tripod but put your camera on it extend the legs all the way out close them up, put the self timer on or if you have a shutter release then hold it up and take the photo, you can get neat angles, and get overhead shots.
Lastly, don't take photos like this:
likes these, you can't tell who people are it looks really stupid and lastly it looks stupid
. If you need to shoot a group set them up, your the photographer, and they want their picture taken they'll do what you say.
I hope you've found this kind of helpful at least. I also wish you the best of luck shooting your next event.