Please check the links below to know if you need a Visa to enter Uruguay.
Uruguay visa: https://uruguay.visahq.com/
Uruguay: Who needs a Visa to go to Uruguay? (Trip Advisor): https://www.tripadvisor.com/Travel-g294064-c116983/Uruguay:Who.Needs.A.Visa.To.Go.To.Uruguay.html
Letter of Invitation
If you require a visa to enter Uruguay and need a letter of invitation to the symposium, please contact us at firstname.lastname@example.org, and include ‘Letter of Invitation Request’ in your subject line. (The letter of invitation will be faxed to you or sent to you via email. We will not send original letters to embassies or provide assistance in securing a visa.)