A couple of Newtown officials were invited to Washington DC last week to take part in an Intergovernmental Affairs informational conference.   The Newtown Bee reports that First Selectman Dan Rosenthal and Police Chief James Viadero took part in the event focused on improving the federal-local relationship and to advance shared priorities.  The event came near the end of a two-year initiative to host county commissioners and municipal officials from across the country.  Among the administration officials in attendance were Small Business Administrator Linda McMahon, representatives from the Department of Housing, Education, Energy and Veteran Affairs.