If you look at the page source you will find that page is full of javascript calls like

<td width=50% onMouseOver="this.bgColor='yellow'" onMouseOut="this.bgC
+olor='white'" onClick=goAction(2557131,2)><font color='Blue'>Mite Inv
+itational Tournament</font></td>
[download]

Sometimes it is easy to figure out what the javascript does, sometimes it is not so easy

in this case goAction(2557131,2) SEEMS to submit a form POST event to "Events.asp?MO=2", with variables txtEvent=2557131 and txtAction=2, because it is a POST event these do not show up in the URL

you could try to create a curl or LWP request to simulate that posted form