Asp.Net web forms pages can be notoriously difficult to scrape, because of the complicated ViewState hidden form input. Some times that's even a feature ;)
In this case, I would go for the rss feed, found via one of the links on the page you are trying to scrape:
http://www.fightingillini.com/calendar.ashx/calendar.rss?sport_id=9
The link will give you the same content, but in a much-friendlier and standard XML format. The code to parse this will likely be easier to parse correctly. Most of all, the format here is guaranteed to be stable, whereas on the regular page even small tweaks to the site theme could throw your parsing code off.
The point is that rss links are, in a sense, made for scraping, so look there first.
Here's an example of one of the current entries:
<item>
<title>2/6 11:30 AM [L] Softball vs Winthrop</title>
<description>L 1-5 http://www.fightingillini.com/calendar.aspx?id=8670</description>
<link>http://www.fightingillini.com/calendar.aspx?id=8670</link>
<guid isPermaLink="true">http://www.fightingillini.com/calendar.aspx?id=8670</guid>
<ev:gameid>8670</ev:gameid>
<ev:location>Athens, Ga.</ev:location>
<ev:startdate>2015-02-06T17:30:00.0000000Z</ev:startdate>
<ev:enddate>2015-02-06T20:30:00.0000000Z</ev:enddate>
<s:localstartdate>2015-02-06T11:30:00.0000000</s:localstartdate>
<s:localenddate>2015-02-06T14:30:00.0000000</s:localenddate>
<s:teamlogo>http://www.fightingillini.com/images/logos/site/site.png</s:teamlogo>
<s:opponentlogo>http://www.fightingillini.com/images/logos/z16.png</s:opponentlogo>
<s:links>
</s:links>
</item>
The page also has an iCal link, if that works better for you.