I ran into the same error that Tayala ran into. It may just be that going to the Coliseum in the afternoon caused this since when I did coliseum then the art lady, I didn't get this error. I downloaded back in January and just played today so maybe I have an old version. I looked at the traceback error and think this is the only relevant two lines:
BloodandLust-1.0-pc\renpy\ast.py", line 1600, in execute
rv = renpy.game.script.lookup(target)
BloodandLust-1.0-pc\renpy\script.py", line 873, in lookup
raise ScriptError("could not find label '%s'." % str(original))
ScriptError: could not find label 'eveningseconday'.
I hope this helped with your game. Additionally I just wanted to ask if there is only two days or if I'm just making the wrong decisions.