So this Shabbos Ki Sisa, here are some choices I have:

R' Mordechai Becher, scholar-in-residence at Nachlas Yitzchok (0.5 mile walk for me)
Fri. Night @ 8:30
Shabbos Day @ 3:30
Motzai Shabbos @ 8:30: "Kiruv: Igniting the Spark"

Dr. Marc Shapiro, scholar-in-residence at Young Israel of Hillcrest (a 1.3 mile walk for me)
Friday night: "Is Historical Truth an Orthodox Value?"
Shabbos after Musaf: "Judaism and Islam: Some Historical and Halachic Perspectives"
Shabbos after Mincha: "The Philosophy of Rav Kook: Is It Still Relevant?"

R' Paysach Krohn, scholar-in-residence at Utopia Jewish Center (a 2.1 mile walk for me)
Shacharit: "Sanctity of The Synagogue"
Pre- Mincha Shiur: "Enhancing Your Life with Reflective Enthusiasm"
Seuda-Shlishit: Dvar Torah