Parties toast demo derby

Upfront after-bashes celebrate nets

At their upfront after-parties, networks look to seal the deal with the most important demo of all — the 25- to 34-year-old ad buyers, who line up by the dozen to take a Polaroid with their favorite TV stars.

NBC kicked off festivities with an after-party on the ice rink at Rockefeller Center. On Tuesday, ABC lined its high-wattage stars around the perimeter of a big-top in the gardens of Lincoln Center. Lines stretched around the room for photos with the cast of “Lost,” “Desperate Housewives” and “Extreme Makeover: Home Edition.”

By midweek, as the spirits of even the most ardent TV enthusiasts began to flag, CBS bused the media horde from Carnegie Hall to Central Park’s Tavern on the Green.

Not to be out-done, Fox gave buyers given ample opportunity to share airspace with “Stacked” star Pamela Anderson and partake of other diversions such as chocolate martinis and air hockey at its Central Park Boat House soiree Thursday evening.