One of the advantages we had this year was that FSP had already booked "Agora Valley" for the week, so we didn't have many surprised people interspersed with vendor set-ups such as the dome. Not that I mind meeting random campers, but I think that fact allowed Rogers to give is a little more leeway in that area in the early week. I.e, they didn't have a problem with the late music on Sunday through Tuesday. As I've understood it, FSP usually books Rogers for the week before their busy season (if they actually have one) begins, so we may end up running into a distracting number of regular campers who want us to simmer down a bit.
I think the lead-in idea has some potential, however in my case (and others may be effected by similar circumstances), it's easier for me to take a full week off from work and get the weekend on both ends rather than split two weeks.
However if the idea of having Somalia-Fest for a half week after Porcfest takes hold, I'd probably make arrangements to be at Rogers for the full week and a half.