Visas

To attend the PASI2008 conference you may require a tourist visa to Argentina.

U.S. citizens do not require a tourist visa.

Other nationalities exempt from a visa can be found in here.

Contacts in US
Consular Section of the Argentine Embassy, 1811 Q St., NW, Washington, DC 20009 (202/238-6460) or the nearest Consulate: CA (213/954-9155), FL (305/373-1889), GA (404/880-0805, IL (312/819-2610), NY (212/603-0400) or TX (713/871-8935).
http://www.embassyofargentina.us/espanol/seccionconsular/tourist.htm