There's a certain hint of a Mardi Gras-ish nature to Eid, being the end to a lot of fasting and such, not that people are getting plastered on alcohol and throwing beads to women to get them to flash their breasts or anything.
There still is no particular pattern to AQ terror attacks or the Iraq insurgency that would indicate that Ramadan in any way is some especially particular focus of a time to attack, as much as people want there to be.