The email says 10am - 5pm.
I think they basically sent one out right after the January admissions, and the whole thing is set up by current students, so they may just be a little slow... if you're in the Facebook group, you could ask one of the second year students about it/make sure it's okay to still come even though you haven't "RSVP'd" through the Google Doc they sent out. I'm sure it will be fine
Worst case scenario, I think you should just show up if you're local! They haven't really sent out too much information about it (i.e. I have no idea if it's a whole day event or just a drop in thing).