Great question, lpmediaconsultingcom! 🙂
Right now, there is no built-in way to email attendees. Probably the simplest way to get the emails is to export the attendee list and pull the addresses out of the resulting CSV.
I love your idea for a feature! We’d be most grateful if you would suggest it on our User Voice site: https://tribe.uservoice.com/, that way we can judge how valuable it would be to the community at large.
Thanks for being a TEC user! 🙂