Question:
Answer:
We would generally counsel that Catholics not do so, as it could be an occasion of sin for them, including having to endure calumnies presented—and received well by most in attendance—against the one Catholic Church Jesus Christ started as his instrument of salvation. This is not to overlook the negative actions of some Catholic leaders that contributed to the Protestant Reformation, but rather simply to recognize that various doctrinal errors will be promoted at such a celebration and so it will not likely be an edifying activity for most Catholics.
We would make one exception. For Catholics who are well-formed in their faith and skilled in apologetics and evangelization, attending such an event could produce fruit in defending and advancing the God-given mission of the Church (see Matt. 16:18-19; 28:18-20). Such a Catholic witness may not likely be welcome by many at such a Reformation celebration, but if the apologists and evangelists conduct themselves in love and humble zeal, they would likely prevail in getting some of the Protestants participants to listen to them (see 1 Pet. 3:15).