TheMandarin Hotel Bangkok is a 4* star business hotel located at only 5 min walk from the conference venue.
Other options near the conference venue:
At only 15-20 min walk from the conference venue (10 min by car), the Silom area offers numerous budget options with 3* and 4* hotels offering rooms from only $40 USD / night.
TheTriple Y Hotelis located literally across the street from the conference venue. It is a modern looking business design hotel. Rooms start at around $100 USD / night.
TheCrown Plaza Bangkok Lumpini Parkis a 5* star hotel located at 15-20 min walk (8 min by car) from the conference venue. Rooms start at $160 USD/night on discount sites (Agoda, booking.com, etc.)