I dont know where the post is, but I found this link and here are some suggestions:
1. Indicate that the reception is to be adults only by having the words "Adults Only Reception" or "Adult Reception" printed along with the reception location and time on the invitation.
2. Do not use phrases such as NO KIDS, NO CHILDREN, etc. The only correct wording is Adult Reception or Adults Only Reception.
3.This information should be printed by the printer on all invitations. You must never write ANYTHING by hand onto the invitation itself - whether it pertains to this or any other matter. Doing so is considered socially incorrect (in other words, tacky!) and inappropriate.
http://www.superweddings.com/etiquette.html