When you’ve just sent an Evite invitation, there’s nothing more annoying than opening it obsessively and seeing all the guests’ names just sitting there in the "not yet replied" section. Oh wait, there is one thing more annoying: seeing all the names in the "not yet replied" section next to the date that person viewed the invitation … but didn’t reply.
I feel your pain, party hosts, but there are often good reasons why someone didn’t reply right away. They might not be sure of their availability; they might be short on time; they might want to see if certain other invitees are (or are not) attending. To give fellow hosts some peace of mind, let us know when you reply.