Paul Perry’s mission: Give his listeners a glimpse of Heaven during free mini-concerts this month in Grass Valley, marking the pre-Christmas season of Advent. The concerts, offered each Wednesday through Dec. 19 as a respite from the Christmas rush, have become a tradition at Peace Lutheran Church, where Perry is organist. And, they are among a broad range of musical expressions of faith and festivity at the church during the Christmas season, which extends into early January. “Peace Lutheran Church is the sound of music in our community,” said congregation President Gerry Mitchelmore, a Lake Wildwood resident. In the large …