Trade shows aren't what they used to be, but they're still around. Most of them have shrunk, but don't avoid them for that reason. In 2014, I attended the BEA (BookExpoAmerica) in New York; (ICRS) the International Christian Retail Show; (ICVM) International Christian Visual Media; and CPE (Christian Products Expo), sponsored by Munce, a group of about 400 independent Christian bookstores. And there are others, such as the Gideon Film Festival and National Religious Broadcasters.
Some call themselves conferences, but they function much like trade shows such as the American Association of Christian Counselors, which I attended in 2014.
Many writers bypass trade shows because of the cost. I see them as significant for networking and connecting with others in the publishing business. Imprint networking on your brain.
In 2002, Elaine Wright Colvin wrote a list of 13 tips for her organization and newsletter, WIN (Writers Information Network), for attending conferences. The list was so practical that I've kept it on my hard drive. The principles remain the same, although I'm quoting only some of them (with Elaine's permission).