I was looking at BUR-FLR/VCE/FCO (as BUR is the closest airport to me) and finding almost nothing (looking end of August/early Sept.) - but, more importantly, I couldn't find anything longer than 1 week.
Resigned myself to a short trip, then suddenly discovered that SNA-FCO was wiiiiiiiide open. A bit far for me to drive to, but ended up booking 8/23-9/4 - and for less money than ex-BUR, all on UA metal and only 1 stop each way!
[EDIT: This was an accurate image for those dates as of about an hour ago, i.e. 7 AM PDT/10 AM EDT.]