Easter and communion both partly originate in #passover and both incorporate elements from pagan sources. The Christian "Passover", aka #easter, isn't Passover even though it's called that in many languages. It's actually a paganized "strange fire" amalgamation of Passover, Firstfruits, and numerous pagan holidays.

When did the Christian church stop keeping the Biblical Passover in favor of the Roman Pascha/Easter? It was long after the original Disciples were gone, but also well before Emperor Constantine. Check out this talk from Founded in Truth.