The Lemaître Conference 2024 will take place in the Specola Vaticana (Vatican Observatory) headquarter
Specola Vaticana/Vatican Observatory
Via Anfiteatro Romano, 1- Albano Laziale
https://maps.app.goo.gl/FbhpQxmLqhEaxm2N7
At the gardens gate show ID or your badge and walk to the Specola.
If you have problems to enter through the gardens gate you can also ring the bell at the Specola pedestrian door.