Fellowship with LCMS

I take it that when you ask about participating in an “LCMS church,” you have in mind a worship service in an LCMS church.  Building on that assumption, I can be present at such a worship service, but I will refrain from doing what I do in a worship service in a church of our fellowship:  worshiping and communing.  Certainly, I will be respectful of those who are worshiping and seek not to be a distraction to them.