Can we do a Reception into the Full Communion of the Catholic Church for several non Catholic Christians the Easter Vigil if we do not have any catechumens being baptized at the Vigil?
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You may, but why would you? They can be received whenever they are ready. They need not wait for Easter.
See my book When Other Christians Become Catholic for arguments in favor of receiving baptized candidates throughout the year – not at the Vigil.