"Repent and celebrate: The Reformation after 500 years," co-authors Sarah Hinlicky Wilson, assistant research professor at the Institute for Ecumenical Research in Strasbourg, France, and editor of Lutheran Forum, and Thomas Albert Howard, professor of history and director of the Center for Faith and Inquiry at Gordon College in Wenham, Massachusetts, cite as a way forward the paradigm of "receptive ecumenism" that I've found fruitful for my own work in ecumenical theology:
What we are looking for is an elimination of the necessity of enemies, not an elimination of the necessity of arguments. We look forward to a multiplicity of purged confessional theologies, maintaining the particular gifts and insights on all sides while remaining open to the truly Christian insight of the other, even of the old enemy. In the words of the Catholic ecumenist Paul Murray, we propose a "receptive ecumenism" and encourage all parties to ask: What can we offer and what can we receive from others to foster a deepened communion in Christ and the Spirit?
The whole article is available on the Christian Century web site. In this connection I also commend From Conflict to Communion: Lutheran-Catholic Common Commemoration of the Reformation in 2017, a resource issued jointly by the Catholic Church and the Lutheran World Federation based on five decades of bilateral international ecumenical dialogue between the two communions. From Conflict to Communion offers helpful guidelines for ecumenically responsible observances of the 500th anniversary of the Protestant Reformation (available online in PDF; click on hyperlinked title). Baptists and others in the free church tradition will find an account of Baptist/free church identity in ecumenical perspective that resonates with what Wilson and Howard propose in Curtis Freeman's book Contesting Catholicity: Theology for Other Baptists (Baylor University Press, 2014).