All; Several questions were asked about when and what types of visa attendees should acquire for Buenos Aires. We investigated whether we could provide or get one authoritative answer for the different situations. Unfortunately, it has not been possible for us to provide information beyond what various official and unofficial sources already provide. See below for a list. The best advice we can offer is to follow what you'd normally do for any international travel, e.g., if the matter is unclear in your case, talk with the appropriate consulate, embassy, or corporate advisor. Ray IAD 1. Republic of Argentina Visa Information: http://www.clond.mrecic.gov.ar/en/node/2424 2. Visa Policy of Argentina: https://en.wikipedia.org/wiki/Visa_policy_of_Argentina 3. IETF 95 Visa Information: https://www.ietf.org/meeting/95/visa-information.html