No clue what happening with this dimmer connection
Neutral on White, continuing to elsewhere.
Unswitched Hot on Red, continuing to elsewhere.
Switched Hot on Blue, going to whatever fixture the dimmer controls.
Following new information that the receptacle on red/white is controlled by the dimmer:
Switched Hot on Red, going to at least two locations. Presumably one is the receptacle?
Unswitched Hot on Blue, going to the dimmer..