Records of landsmanshaftn are kept at YIVO and AJHS which are located at Center for Jewish History. To find if your society has records check JGS of NY website https://jgsny.org/searchable-databases/indexes-to-jewish-organizations/yivo-landsmanshaftn-collection
The lecture about which you refer, I believe, was mine. I have been presenting on the topic of landsmanshaftn at IAJGS conferences for many years, have given webinars (one recently for JewishGen) and have written a number of articles on the subject in Avotaynu. Feel free to contact me for more assistance.
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Avrohom Krauss
Kiryat Yearim (Telz-Stone) ISRAEL
kraussfig@...
Researching: KRAUS, GOTTFRIED, MONAT from PRZEMYSL (Galicia) Poland/ KINSTLICH, GREENBERG, SCHMIDT from Tarnobrzeg, Rozwadow, Ulanow (Galicia) Poland
KLOTZ from Telsiai, Lithuania/ ROGOZIN, KAPLOWITZ, from Vyazyn, Ilya, Vilyayka, Belarus /LAPIDUS, SOKOLSKY, ROGOZIN, Maladzyechna, Belarus