For the invited speakers, rooms will be arranged at the Hampshire Hotel.
There is a direct train connection between the airport (Schiphol) and Delft, and also between Amsterdam Centraal and Delft. In both cases you can also change trains at Leiden.
If you are instead approaching Delft from the east, note that the trains between Rotterdam and Delft are disrupted the whole week, but there are several alternatives. One of them is to take the first metro from Rotterdam Centraal in the direction of Den Haag, get off at "Laan van NOI", and from there take the first train to Delft.
In all cases the NS travel planner is helpful.
Some relevant locations for the conference can be found here.
This is the hotel for the invited speakers.
Address: Koepoortplaats 3, 2612 RR Delft
The conference will be held in the EWI highrise building, building 36 of TU Delft.
Address: Mekelweg 4, 2628 CD Delft
The conference dinner (Wednesday 18:00) will take place in restaurant 't Postkantoor.
Address: Hippolytusbuurt 14, 2611 HN Delft.