Pointless
A basic function of any app representing a site like the Colosseum is that you should be able to buy tickets on it (as this one claims to do). The calendar module for booking tickets in the app is broken and there is no way to select a date. It just tells you it’s sold out on the day you are using it but no option to look at tickets days, weeks or months into the future. Seriously, this is really 101/Basic stuff. Check your app actually works before you release it to the public.