Unsurprisingly, the answer differs based on which Lutheran you ask.
For example, the Evangelical Lutheran Church in America, which is by far the largest Lutheran denomination in the United States practices open communion by which any baptized Christian is welcome to celebrate the Eucharist with them. In fact, for the last twenty years, the ELCA has had a formal relationship of full communion with the Presbyterian Church USA and Reformed Church in America, respectively the first- and third-largest Calvinist churches in the United States. However, neither the Lutheran Church-Missouri Synod nor the Wisconsin Evangelical Lutheran Synod do so. Both groups limit communion to their own members or to members of churches found to be in full doctrinal agreement with their beliefs, a requirement that necessarily excludes Calvinists.