Honestly, most churches don't do many altar calls these days. They will do them during special events and such, but not usually in a traditional service. Honestly, I think that is fine, because in my experience most people don't get saved during altar calls, they get saved when they are talking things through with people and have their questions answered first. Altar calls are not something Scripture ever says we should do, we just do them because it is an easier way for us to sort out who wants to get saved or not, especially during big services.