Earlier quoted context omitted.
I agree, there's so much friction trying to get a group of people to signup for and use another platform. A personal anecdote: people were willing to fly thousands of miles to come to my wedding, but (almost) nobody wanted to use the site/app we chose to avoid using Facebook to plan the event. I think the only option is to make it seamless for Facebook users--let them log in with FB, use FB Messenger to send them upd…
We are really trying to limit friction. Creating events requires a profile. RSVPs does not. Also, Stuff invitations can still be distributed on any other platforms with a simple "one-to-many" link. Hope this makes sense. Simon, Stuff.
You just need to cc the address in an email and it sends invites to all of the people in the email list. I used it for an event of about ~30 and most people added their RSVP. It has chat too, but that wasn't as successful. Email is obviously not the 'coolest', but this approach at least reduces friction. I spent about a month thinking about / building this and would be happy to chat.
Edit: kinda funny we both chose pink :)