Over last week February 26th, Liechtenstein's Sovereign Prince HSH Prince Hans Adam II was in the American capital Washington D.C for a couple of events
First he paid a visit to the Liechtenstein Embassy and met with the Germanphone speaking country official representatives and ambassador Claudia Fritsche.

Very excited today as H.S.H. Prince Hans-Adam of Liechtenstein visited @EmbassyLI while in DC for a conference. pic.twitter.com/6Igm3Hnr0G

— Liechtenstein USA (@EmbassyLI) February 26, 2016

Then  he spoke at the 9th International Students for Liberty Conference 2016 (ISFLC16). The conference website also notes that a member of Russian's rebelle group Pussy Riot will be first speakers as well, so there's quite a variety of options for attendees to experience.
A video of the event, with Prince Hans-Adam speaking just before the Theater of Public Policy segment, is shown below.