  We consider critical planar Ising model in annulus with alternating boundary
conditions on the outer boundary and free boundary conditions in the inner
boundary. As the size of the inner hole goes to zero, the event that all
interfaces get close to the inner hole before they meet each other is a rare
event. We prove that the law of the collection of the interfaces conditional on
this rare event converges in total variation distance to the so-called
$2N$-sided radial SLE$_3$, introduced by~[HL21]. The proof relies crucially on
an estimate for multiple chordal SLE. Suppose $(\gamma_1, \ldots, \gamma_N)$ is
chordal $N$-SLE$_{\kappa}$ with $\kappa\in (0,4]$ in the unit disc, and we
consider the probability that all $N$ curves get close to the origin. We prove
that the limit $\lim_{r\to
0+}r^{-A_{2N}}\mathbb{P}[\mathrm{dist}(0,\gamma_j)<r, 1\le j\le N]$ exists,
where $A_{2N}$ is the so-called $2N$-arm exponents and $\mathrm{dist}$ is
Euclidean distance. We call the limit Green's function for chordal
$N$-SLE$_{\kappa}$. This estimate is a generalization of previous conclusions
with $N=1$ and $N=2$ proved in~[LR12, LR15] and~[Zha20] respectively.
