Piety demands obedience to our bishops with heresy being the only real exception, and that's a nuclear option. If you want to charge your bishop with heresy for having concerts in the temple, and separate yourself from communion with him, be my guest, but I would weep for you, really. There are like 90 more valid reasons to object to our present bishops and I personally ignore them at least to the extent of all canonical patriarchs of the Eastern and Oriental communions, and almost all hierarchs, as well as most Old Calendar and Old Believer bishops, and a large number of Episcopi Vagantes, many Roman Catholic bishops and some Anglicans. In the canonical Orthodox churches though, I can think of precisely three bishops I have a problem with, one of whom is the uncanonical patriarch of the canonical Church of Eritrea, whose monks are trying to oust and replace with the imprisoned legitimate patriarch. I would receive the Eucharist from any canonical bishop in my communion; assuming for a moment that I was Oriental Orthodox, I would not receive from the Eritrean intruder, whose name escapes me, but I would receive from the monks and other clergy who he was imposed upon by the government.*
So only in a life or death matter, such as the gravest of heresies, is dissent from our bishops acceptable. If one of our bishops took the approach of the Episcopalian Bishop James Pike, and began attacking the Holy Trinity, or icons, or promoting gay marriage, or daring to ordain a woman, I would break communion with any bishop who did not break communion with him following a proper canonical process, or rather his patriarch, if he managed to avoid being deposed, like Bishop James Pike (am I allowed to call him a heresiarch on this forum because he was a non Orthodox prelate who went a step further and denied the Trinity?) whose influence with the media intimidated his brother bishops into not trying him for heresy.
But as far as bishops organizing, and in many cases not only attending, but participating in, Orthodox concerts, even if Indisagreed with the practice,,which I see no grounds for, I see nothing in the Pedalion (granted I'm no canonist; I may have overlooked something) or the ecumenical councils that would forbid this. As long as such concerts are done decently and in order (no rock concerts in the temple, or blasphemies like the "Plague Mass" celebrated in 1990 in the Episcopal Cathedral of St. John the Divine in NYC) I can see no possible objection to them by anyone who retains a sense of focus on their own sins and humbly submits the,selves to the ordinary jurisdiction of their ruling diocesan bishop in accordance with Holy Tradition, reserving separation or other disobedience only for the gravest possible misconduct on the part of the Hierarch. And I can't think of any bishops in recent years who managed to get away with such misconduct, although I'm not as rigorous as some.