Minimal Apple TV Setup For an exhibition I need a minimal Apple TV setup that enables me to connect an iPad to an Apple TV via Air Play. 

→ Ideally I don't want to bring an extra router or computer. Is it possible to connect the iPad to the Apple TV directly without having both joined to a wifi network? 

If this is not the case, what would be an easy to setup solution for this? (Is it e.g. a separate Airport Express to create the network?)
I just called Apple to make sure. The answer is unfortunately as expected: 


No, Apple TV and iPad cannot connect directly without being part of the same network. 
And yes, the best way to create this kind of network would be an Airport Express.


Well.