go to the front desk and ask for the package. i have sent more than one that the idiot receptor thought fedex/ups would come knocking on their door, or the desk staff will go through the luggage room daily to update deliveries.
the package comes with your name and arrival date on it. you go to the desk and tell them you were supposed to receive a package. the desk staff will go and look for the package in their package storage area.
i sent a lot of "stuff" that way. it works. ups/fedex/hotels are a responsible bunch of people.
do not send anything directly to a conference or trade show....ever. the people running the conference/trade show are among the most irresponsible bunch i have ever come across. they are doing you a favor to recognize you exist. they are not in the service business.