Every year each club is allowed to bring in 30 players for updated medicals and interviews. The other clubs in the league know which players are visiting each team.
What I used to do when scheduling visits was to change whom I brought in every year so there was never a pattern as to which player was going to visit. One year, we brought in players whom we were thinking of targeting in the first three rounds. The next year I brought in some people we had already eliminated and players we wanted to "recruit" for post-draft free agency. The following year I brought in a combination of the two.
By doing this there is no way the media or other teams could gauge how we were approaching a given draft.