Passage: The actual process varies according to the laws of the country, and recommendations to donors vary according to the collecting organization.  The World Health Organization gives recommendations for blood donation policies, but in developing countries many of these are not followed.  For example, the recommended testing requires laboratory facilities, trained staff, and specialized reagents, all of which may not be available or too expensive in developing countries.An event where donors come to donate allogeneic blood is sometimes called a 'blood drive' or a 'blood donor session'.  These can occur at a blood bank, but they are often set up at a location in the community such as a shopping center, workplace, school, or house of worship.

Question: A blood drive can sometimes occur where?
shopping center, workplace, school, or house of worship