Yes, it does. Just in case you need printing from Instagram it is mandatory to have internet access on site. If your are sending photos to Facebook or email and you need it in real time, internet has to be available too. In other cases, everything works offline.
By paying the basic plan you have access to 2 simultaneous accesses. It means that you can have up to 2 events at the same time. If you need aditional pairs, they get 50% cheaper. Be aware that you can install Fottorama in no matter how many devices (that is really important in order to have an efficient backup policy). At the same time, you will be allowed to have 2 logged in.
Yes, it is. When you start the slideshow, it is in test mode. The only difference of this mode is that new photos does not appear automatically. You have to refresh the browser. Right before the event get started, click to begin and every new photos will be displayed without touch.