Change this in Preferences to weekly so that your holiday pics are grouped together.

Create a script

Open Applications > AppleScript > Script Editor and type:

on device_is_connected(device_name)
  set check_for_device to “ioreg –rn” & quoted form of device_name
  return (length of (do shell script check_for_device) is not equal to 0)
end device_is_connected

Save the script

Now add the lines:

on run
  if not device_is_connected(“iPhone”) then
    tell application “iPhoto” to activate
  end if
end run

Launch it automatically

Click File > Save As… and set the format to Application.  Save it to the Applications folder.  Open Applications > Image Capture and the preferences pane.  Click Other and select the script.  This runs when a camera is inserted but for the iPhone it quits before starting iPhoto.