We do. David Bryant came out with the book on them in 1988. I (Doug) remember participating in a Dave-Bryant-led Concert of Prayer around 1989 or so. Unforgettable. Let’s try them again. David Bryant has recently made available a free online ebook at https://proclaimhope.org/books/concert-of-prayer-manualtogether-in-hope-free-ebook/. Seems like hope is in short supply. Let’s ask for some. Join us? We’ve scheduled one at a megachurch in Fort Lauderdale on July 9th. (Join us? https://communitycc.com/prayer/). Let’s do this.