According to the CTI guide, the Pavilion of Festivals and Concerts was one of the largest buildings of the Fair. It was connected to the Pavilion of Music. They hosted the Electricity Hall, the Display of the Marvels of Electricity, the exhibit of Professional Teaching, and the Swiss Exhibition. The facades of these interconnected buildings were admirable for their elegant proportions and the richness of architectural detail. Among the decorations, the Guida Tricolore mentions two fountains with a statue of Neptune created by Cellini, a group of allegorical statues symbolizing music made by Monti, and the remarkable sculptures created by sculptors Biscarra and Bianconi. The interior featured the grand "Salone dei Concerti" (Concert Hall) built like an Olympic theater that could hold up to 9,000 people.

According to the CTI guide, "the Exhibition of the Ministry of the Telegraph, Telephone, and Postal Services was interesting in many aspects, as it collected curious objects that by now have the value of relics and objects of historical importance that tell us about a by-gone age." The Pavilion was 2 storeys high and was designed by architect Calderini. It included two side halls of approximately 60 meters each, surmounted by octagonal domes. The central hall was surrounded by a two-storey gallery. One of the main features of this exhibition was the "Stazione Radiotelegrafica Marconi."