  We investigate sub-AdS scale locality in a weakly coupled toy model of the
AdS$_3$/CFT$_2$ correspondence. We find that this simple model has the correct
density of states at low and high energies to be dual to Einstein gravity
coupled to matter in AdS$_3$. Bulk correlation functions also have the correct
behavior at leading order in the large $N$ expansion, but non-local effects
emerge at order $1/N$. Our analysis leads to the conjecture that any large $N$
CFT$_2$ that is modular invariant and has the right low-energy density of
states is dual to a gravitational theory with sub-AdS scale locality.
