Do you have any questions or comments about the nature of our activities? Skepticism is not a universally agreed upon term as so can be misleading.
No. I assume that it means 'question absolutely everything'.
Tell the group and the organizers a little bit about yourself. Include things like nationality, places you've lived, things you like to do, etc.
Will introduce myself in person.
Englishman living in HK for 14 years.