Guest list, in the event page's Actions menu, shows everyone with their answer. Download saves it as a spreadsheet; Copy names copies the names to paste into a message.
Pick Everyone, Yes, No or No answer at the top to choose who is on it. Once the event is over, Came is there too.
The spreadsheet has each person's name, how many are coming, their answer, their mobile and email, and their groups. It opens in Excel, Numbers and Google Sheets.
Add to Apple Calendar and Add to Google Calendar, in the same menu, put the event in your own calendar, with a link back to its page.