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Is attending public lectures (and looking at the screen) permissible on the Sabbat? Information from a computer is projected onto a movie screen and the lecturer may be using a microphone. The lectures take place in any event.

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you have a few different questions here (is learning non-jewish material inherently not part of Sabbath observance, can one capitalize of a non-Jew's use of forbidden technology on the Sabbath, is one misleading others into mistake if he attends such a lecture though he is visibly Jewish, will this lead to other violations...among others). Could it be focused or split up? – Danno May 7 '13 at 17:34
I think this is a good question if the last part, about non-Jewish topics, is spun off into its own question. (After all, that question is interesting regardless of the technologies that are or aren't in use.) – Monica Cellio May 7 '13 at 17:43
It could also be more generalized to include any number of scenarios in which one is part of a group for whom someone is doing Melachah. – Seth J May 7 '13 at 17:50
@Dan, I think that the question is sound. The scenario is a very common one (happens all the time in colleges everywhere) and the question asks, essentially, whether anything is wrong with attending a college class or convention lecture or the like on the sabbath. – msh210 May 7 '13 at 18:21
up vote 1 down vote accepted

See Rabbi Torczyner's lecture on attending conferences.

If I understood and recall his lecture correctly, generally speaking, where necessary it would be permissible, assuming that the speaker would be using the same electronic devices regardless of your presence.

(Rabbi Torczyner always starts with "ask your local synagogue rabbi for actual psak", of course.)

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