Train: Bergamo is easily reachable by 40 minute travel by from Milano (Stazione Centrale, Milano Lambrate or Milano Porta Garibaldo),
Car: about 45 km from Milano. There is a "Bergamo" exit on A4 highway. Parking: For those arriving by car, 20 meters from the hotel there is the Central Parking whose maximum cost is 15 € for 24 hours. The Congress Center has an agreement for which you can probably halve the cost.
Airplane: The closest airport is Orio al Serio, however there are bus connections also from Milano Linate.
The Congress Center is at very short walk from Bergamo central station, where also stops the bus from the airport (line 1).
You can find the Bergamo bus timetable at the link: https://www.atb.bergamo.it/it/viaggia-con-noi/linee-e-orari