Wir erwarten 500 Konferenzteilnehmer von überall auf der Welt, die in Universitäten, Forschungseinrichtungen und Archiven sowie NGOs aktiv sind. Den Historikern, Forschern und Multiplikatoren wird die Möglichkeit geboten, Ansichten und Erfahrungen auszutauschen sowie Kontakte für ihre zukünftige Arbeit zu knüpfen.

We are expecting around 500 delegates from all over the world, active in universities, research institutes and archives as well as in non-governmental organizations. Historians, researchers and educators will be offered the opportunity to exchange views and experience and to establish contacts for their further work.

I am not sure about the translation for "Multiplikatoren", a word for people that work in NGOs. I am not sure about whether you say exchange experience or experiences. The words "Historians, researchers and educators" shall be the counterpart to "universities, research institutes and archives as well as in non-governmental organizations" - The translation does not have to be litarally translation. I just need the text in formal English.