No, but guests might be. According to this, "A recent survey conducted at major hotel chains across the U.S. reveals that most hotel bath, shower and sink fixtures deliver water at scalding temperatures." Scalding showers were found at almost 90 percent of the hotels surveyed. The problem is that, on the other hand, if the water isn't hot enough, it will contribute to bacterial growth.
Despite the movie title, while Some Like it Hot, your attendees probably don't want a pre-meeting scald. Another thing to add to your site inspection checklist: Ask if the hotel showers use P-valves in their showers and, if they do, how often they adjust them. If they have the newer, temperature-pressure adjusting valves, it's not a problem, according to the item.