I'm just about finished the main refurbishment, and am having a BBQ for all the trades and people who have helped (except the Sparkies, who were a pain).
The question is: would you invite the CO? Would he be allowed to accept? There's no particular agenda.
I'd also answer yes.
I don't know about any constraints on a CO being able to accept such an invitation, but I can't really see why not. Especially as you're marking the end of the project so it's a bit late to think of bribery now. :wink:
Before you invite him, I think you need to think carefully about how much you plan to drink.
It might not be a good plan to get hammered, tell him that he's your best mate and giggle about the 17th century barn that you demolished before anyone noticed.