Not exactly sure if this is etiquette or not but here goes. Is it necessary to provide an insert with the wedding invitations, which lists a block of hotel rooms near the wedding venue? I am having an afternoon wedding (reception will be over by 5 p.m.) and most of our guests will be somewhat local (within an hour travel time). Is blocking off rooms necessary or optional? Is it tacky to simply have a number of nearby hotels listed with the invitations vs. blocking off rooms? I am not having a wedding website, I understand a lot of brides use that for information nowadays.
I already contacted the closest hotel to our venue and their policy is, if you block off rooms, and any of the rooms are unused by the wedding guests, you are responsible for paying for the rooms. Not sure if that is normal or not, but seems extreme!
Any help is appreciated

Thanks!