  In this paper, we provide a comprehensive study of asymptotically flat
spacetime in even dimensions $d\geq 4$. We analyze the most general boundary
condition and asymptotic symmetry compatible with Penrose's definition of
asymptotic null infinity $\mathscr{I}$ through conformal compactification.
Following Penrose's prescription and using a minimal version of the Bondi-Sachs
gauge, we show that $\mathscr{I}$ is naturally equipped with a Carrollian
stress tensor whose radial derivative defines the asymptotic Weyl tensor. This
analysis describes asymptotic infinity as a stretched horizon in the
conformally compactified spacetime. We establish that charge aspects
conservation can be written as Carrollian Bianchi identities for the asymptotic
Weyl tensor. We then provide a covariant renormalization for the asymptotic
symplectic potential, which results in a finite symplectic flux and asymptotic
charges. The renormalization scheme works even in the presence of logarithmic
anomalies.
