The site must be selected with the local weather in mind for the time of year of the Congress. In selection of a site, consideration must be given to extracurricular activities, including entertainment. This point also includes consideration of the weather. Accessibility is a major concern. Since many Members will be coming from different continents, ease of access to the site, by air or train, is very important.
Cost is an important consideration.
The cost per attendee is critical to permit as many Members as possible to attend the Congress of their Society.