For Guest LDT
"I think I'll have to find myself a B&B."
I'm fairly sure there are B&Bs that will be cheaper than the actual hotels: they will get booked up a long time in advance, though.
"What would be the best combination of lets say 3-4 days to do? Is mid-week or weekend best to catch all the stuff going on?"
Mid-week has by far the more interesting stuff, in my opinion, although slightly less dance displays etc. on the sea-front.
Can't answer your stewarding query - don't know.