Well it is good enough for us? So we know how many numbers to expect so the event goes as smoothly as possible. The event will go ahead, there will not be an issue based on the numbers. We very rarely have to Limit the number of participants. We have enough people behind the scenes to make sure the event is well handled even if the event has a staggering amount of interest.
Not sure why you are having an issue with your Ipad. I apologize for the inconvenience you are having regarding that. I would recommend that you try to sign up using your phone or desktop/laptop.