The hiker unregistered from my car and not from the hike itself but didn’t show up. Welcome next time if properly registered and, if necessary, properly unregistered.

She showed interest initially (via private message on HB) but no contact afterwards. Specifically, no answer to my follow-up inquiry (I asked about her hiking skills since her profile is empty), didn't join WA group and didn't show up (also without giving notice).

Her profile was empty and I couldn't judge her abilities for the event. So, I cancelled her participation. Maybe another day and another hike.