Is it possible to use multiple iPads (or Android devices) during 1 event? My colleague has tried using 2 iPads but it seems that the change data flow has been synchronized with only one of them. Is the issue a natural consequence?
The check in app will work offline as well. It will cache all the checkins and then push them to the event in Marketo once you have established a connection. Using multiple devices at the same time should never be a problem.
We used 2 iPads at 1 event with open Wifi connection, without problems (2 different user logins). But if you cache it on the iPad whilst there is no internet connection, this potentially could lead to an issue, but I'm not sure.