I've thought back and forth about whether or not doing every house in a night should be a guarantee or not. The way I see it, in it's current state, I think that doing every house each night is encouraged/implied (just the nature of hard ticket events imho). The way I see it I think that a couple of ways to fix this are:
1. Treat the event like Margi Gras and make it every day/night. They could also use a system like Six Flags (of all places) where the outdoor stuff is included with admission but the Houses are an upcharge. They could then sell different ticket packages to accommodate different guests (all purpose, IP houses only, etc.). Essentially make the event as customizable as possible.
2. Take a page from HHN Osaka and open the houses during the daytime before the event officially starts. People who want to only spend one day then have way more time to do houses and there isnt a mad dash at night. The houses are self contained enough to prevent people who don't want horror to get up in arms.
Just a couple ideas. No idea if they'd work/are possible, but armchairs are the best chairs so hey.