"奠酒祭神仪式" can be translated as "the ritual of pouring libations to honor/appease the deity" or more concisely as "the libation-pouring ceremony for deity worship."
Here, "libation" refers to the act of pouring a liquid (usually wine) as an offering to a deity, and "ceremony" or "ritual" denotes the formal procedure or set of actions performed in such a context. "Deity worship" explicitly states the purpose of the ceremony, which is to honor or seek favor from a god or goddess. Depending on the context and desired level of formality, either translation could be appropriate.