The suggestion of finding Catholic-Lutheran partnerships between neighboring churches is great, and it is what Pope Francis is trying to promote.  The danger is that it such efforts will be fleeting and be confined to the great anniversary and not lead to a lasting collaboration, which is what would really be good to promote Christian unity.  My suggestion would be that such partnerships NOT be tailored to discussing theological subjects, but rather to addressing pressing needs of society and the community.  In that area, there is so much work to be done!  From gun violence to poverty to discrimination, of Catholics and Protestants rolled up their sleeves and started working on those issues, it could be, to quote the memorable phrase from Casablanca, "the beginning of a beautiful friendship."