I cannot seem to get the Kevin route. I avoid him on both day 5 & 6? Then on days 8 and 10 I respond submissively and with "I don't know". However this doesn't prompt a time skip to day 15 and I cannot get the camping scene.
When I say "avoid him", I mean, meet up with him but react submissively, i.e., not straightforward/blunt, dodgy. Choose to leave instead of telling him his argument woke you up, for example.