How do I add contacts to a list I've already created?
Ok, so you've got this killer list and you need to expand it with more contacts? No problem. Head to the RSVP tab of your event and click the List you want to work with.
Once you're within your list select, Add Guest in the top right-hand corner. From there, you can determine which source (.CSV, Gmail, etc .) to add from.
Just remember to hit Save And Exit and watch your list expand.