SPA = Senior Pattern Association
It is flying pattern planes from 1960 - 1975 each class has it's own pattern, kinda like figure skating everyone flies the same pattern in front of a set of judges for 6 rounds...
The comment towards the KCRC club is there is a group of guys who compete and practice in the morning usually during the week as most are retired.. there are a few practice during the weekend.. They prefer not flying while others are in the air so they able to practice.
It sometimes is like watching paint dry...

scott
spa 239
nsrca 529