[Events 2.0] Upload a list of registrants

I should be able to upload a list of invited guests. As it is the only way people become invited is if they receive an email but I cannot send them an email AFTER the initial email has been sent out without creating a whole new list. The Events emails will not allow me to send a list with tags so my only option is to have multiple lists for one invited guest list. Very difficult to keep organized when the list keeps changing. My list of invitees to this event keeps growing and the program does not allow me to seamlessly add people without having multiple contact lists which just makes it so easy for people to fall through the cracks.