[Baugi]

I was looking around my area to see if I could find any SC2 groups etc and I happened to find a place and they are hosting a SC2 tourney for charity (winner gets half the pot, other half goes to human society). From what I understand it is going to be a pretty small tourney and also that there will be several people there that are in much higher league than I and since it's going to be so small, will not be dividing up into different brackets. I realize I will not win, but I want to approach it as if I have every chance, and I will do my best. I'm currently a Silver Terran (almost gold based on the mostly gold opponents that I have been playing) In order to best approach this event, I have a few questions.
1) How should I approach it regarding training
2) Should I even participate considering I about a snowballs chance on the sun of winning
3) Any specific tips?

I have attached links to several replays if anyone is interested in checking them out, if not that's perfectly ok.
http://www.sc2rep.com/replays/download/id/17827
http://www.sc2rep.com/replays/download/id/17828
http://www.sc2rep.com/replays/download/id/17829
http://www.sc2rep.com/replays/download/id/17830
http://www.sc2rep.com/replays/download/id/17831


Also, as a side note, it feels like I have made several requests of the community lately (you guys are great!!!) and I would to be more of a participant than someone who randomly asks questions. I want to give back as well for all the help I have received. If anyone has any suggestions on how I could do that as well? (haha says the 25 year old with a 3yrs old vocabulary mostly consisting of "why") :P Thanks in advance!!