Invited talk is when the organizers of the conference invite you to give a talk, contributed talk is when you yourself submit a paper for a conference. TA.
Russia
Japan in 1884 was considered to be a world power. It was not, however, invited to the Berlin West Africa Conference.
The Czechs were not invited to the Munich conference by the British or French. The British and French though that the Czechs would not help make a deal with Hitler.
Stalin
During the Second Round Table conference, the prominent Urdu poet Allama Iqbal was invited as a delegate to represent India. In the third Round Table conference, the noted Urdu poet, Josh Malihabadi, was also invited as a delegate.
Representatives from Africa
Representatives from Africa - Apex
the Europeans felt they were superior to the africans
Germany was not invited to the Washington naval Conference because it was a defeated central power in World War I. Germany, along with the Soviet Union and other defeated central powers were omitted from the conference of Allied nations. The conference discussed naval disarmament and the growing tension in East Asia and the Pacific.
Psychologist G. Stanley Hall invited Sigmund Freud to the Clark Conference in the United States in 1909. Freud's attendance at this conference marked his only visit to America.
Germany was not invited for obvious reasons. Russia was also left out since they pulled out of the war early.
Web conference is basically hosting a conference solely online. It would be worked by having a host to start the conference and the others will be invited to join. The others must accept the invitation to then join the conference.