Answer

Such an invitation was inappropriate. The Eucharist is offered to non-Catholic Christians only under certain extraordinary circumstances provided for in canon 844 of the Code of Canon Law, which are not met in this circumstance. With a mixed marriage, a Catholic and a non-Catholic Christian usually are counseled to have a nuptial liturgy outside of Mass to avoid the problem of a significant portion of the congregation—including the bride or groom—being unable to receive Communion.