Jeff,
A course not worth 15 rounds is not worth playing, is it?
perhaps a topic for another thread but...
if you don't play it once......
How would you know if it warranted further attention?
If I had followed "conventional wisdom" (the best available GCAish advice available at the time of play)
I would've missed Palmetto (in 1978),Aiken GC (1978),Forest Hills (unloved Ross-1977 right down the street from my home!)and a host of others...The listed courses were at best UNLOVED at the time of play, and mostly villified as outdated cabbage patches.......
To say nothing of what there is to discover nationwide, worldwide, and most importantly the UK/ireland gems.
Gweedore, which barely anyone would recommend in their right mind, and NO ONE would recommend for 15 rounds, and beloved my Goat Hill ( ditto on zero recommendations)are the two courses that have taught me the MOST about the opportunities available for outstanding golf via widely diverse preferred angles,one for coping with wind and slope, and the other for coping with extreme slope and firmness.
So while I can see basing a trip around a worthwhile course and club culture, I could never not sneak away to explore the nearby surrounds.
I think my best prep for an event is to get away from the hoopla surrounding the host course and the NONSENSE that goes in formal practice rounds and sneak out to a nearby gem.