I got a second email the other day, telling me to book now to make sure I get the 3k+5k (for 2 nights paid with Chase IHG card). Now, I had already completed one of those nights, but at least it's a confirmation of what I'm registered for, so in this case (since the website is so useless), the email "prodding" is useful IMHO since it does document my offer and does say I'm registered for it. (I of course therefore am not deleting that email and instead I'm flagging it for future reference.)