It is a very strange oddity that airfields can be closed by declaration and opening hours, but that is the weird and unhealthy world of EUdSSR ... even stranger are things like in Germany, where you need a "Flugleiter" to avoid "Reichsjudenflucht", still.
Just another one for PPR - there are certain airfields at maybe only certain times, where you have to ring before flying there - Prior Permission Required, as PPR says - and anybody knows you find the information most probable in the AIP ... You also don't have to declare emergency to override, you could also declare it a safety landing, without the hazzle of probable investigations before T/O again.