Trieste can be reached by train, bus (e.g., Flixbus), and plane (with train/bus to reach the city itself; in addition to Trieste airport, other relatively close airports are the Venice and Ljubljana ones).
The main conference venue (university campus) can be easily reached from the city center by means of public transport (main bus lines: 17 and 17/).
As for accommodation, from a logistical perspective we can suggest the following hotels, as they are close to both the train/bus station and one bus stop to reach the venue: B&B Hotel Trieste, Hotel Roma, and Hotel Milano.