Mixed seating at a class

Hi,

[This is probably a good time to remind the reader of the disclaimer atop this blog.]

Lectures should be held with a mechitzah separating men and women. However, one may invite a community to a lecture without a mechitzah, for the sake of drawing people close to Torah, if they would not come to a lecture with a mechitzah.

(Rav Moshe Feinstein, Igrot Moshe Orach Chaim 5:11)

Have a great day,
Mordechai