GuestCam works in 100+ countries. If you're currently accessing GuestCam's website from the country where you want to have your event, then you and your guests in that country can use GuestCam.
Please note that the site is written in English, but you have the option to customize your event titles and descriptions in any language. Additionally, since GuestCam is a web app, some web browsers may automatically translate it to the user's default language.