I wish to consult with you about something: I have recently given a lecture about my master's Thesis in a local conference organized by my advisor. The subject had a lot to do with algebraic geometry and tropical geometry. I would like very much to try and submit that very same lecture to other conferences. No need to say, algebraic geometry is a vast field, and the title of such conferences is very specific, and not every conference of algebraic geometry is suitable for my lecture. given all that, my question is: under which circumstances will it be appropriate to submit my lecture?
Another question, on the practical side, If I can't find a decent "call for papers", is it still appropriate to propose my lecture to the conference organizer via an E-mail? Is it OK if my paper has not yet been published except for the arXiv?
On a side note, how do one finds out about conferences and 'calls for papers'?
Thank you.