All Saints…
First, as a Catholic you cannot attend a Lutheran service as a substitute for the Mass. Your obligation to attend Mass on Sundays and Holy Days remains-- and Christmas is a Holy Day.
Secondly, you cannot receive communion in a Lutheran church.
Thirdly, it is unwise to accept the invitation of those who have left the Truth of the Catholic Church for a sect such as Lutheranism. They have put themselves in great moral peril, and they want to suck you along with them.
Here is documentation, from JPII’s encyclical Ecclesia de Eucharistia, which explains this in detail why you cannot attend their service in lieu of the Mass nor receive communion:
The Catholic faithful, therefore, while respecting the religious convictions of these separated brethren, must refrain from receiving the communion distributed in their celebrations, so as not to condone an ambiguity about the nature of the Eucharist and, consequently, to fail in their duty to bear clear witness to the truth. This would result in slowing the progress being made towards full visible unity. **Similarly, it is unthinkable to substitute for Sunday Mass ecumenical celebrations of the word or services of common prayer with Christians from the aforementioned Ecclesial Communities, or even participation in their own liturgical services. **Such celebrations and services, however praiseworthy in certain situations, prepare for the goal of full communion, including Eucharistic communion, but they cannot replace it.