Thanks datitisev , thanks for pointer. I'll dig in that direction.
SecurityDog, thanks. The idea of invitees and attendees is high on my list, I think I want to add pagination and event pages first and then look at adding the UI and data for attendees and linking with discussions.
BayuHerkuncahyo I opened GitHub issue for the import. I can add close button in next beta.
phenomlab I opened a GH issue for that. Also need to think how best to control potential spamming.