Not usually a concern with conferences that are so likely to sell out.The site says 1pm MST for the conference. 9am EST for the hotel.
The hotel EST time and the conference MST...someone is going to get this mixed up, I'm sure.
My concern is that you can book the hotel (9 a.m.EST) before you can book the conference (3 p.m. EST). Although there is nothing saying the hotel $ are not refundable explicitly, sometimes when there is a deep discount on the room as there is here, it is NCNR.