1. Be Open Minded
We are all here to learn from each other. Come with an open mind and learn from your peers even though you are the speaker.
Debates are encouraged in the spirit of learning but there's no purpose in allowing discussions and discourse to turn abrasive. It will not serve anyone's purpose. If things start going off track, it is sometimes best to wrap it up and move on.
2. Be on time
As a speaker, do come a little early if you are not familiar with the venue and get to know the venue manager/owner. Being on time shows respect and eagerness to meet the host which always sets things off on the right foot.
3. No Hawking
Again, at the risk of sounding repetitive, the objective of Hackers & Painters sharing sessions is to share what you know and learn from your peers (even as a speaker). You are not there to sell (as a speaker) or to be sold to (as a member of the audience or participating in discourse). Though of course, if in the course of your sharing session, you are perceived as a subject matter expert and members of the audience says something like "Wow, that's awesome mad skill - can I pay for your product/time?" then it's fair game.
We recommend that as speakers, you take no more than 1 hour to compose your thoughts and presentation on what you would like to share a day or two before the event. There's no necessity for formal presentations or elaborate keynotes/powerpoint slides and the emphasis should be to share the know-how on a specific subject matter. The ideal scenario is to share what you have learnt in the course of your 'day job' or while working on a side project of yours. Preparation is good but there's no necessity to over-prepare. Simply share some interesting knowledge or techniques that you have recently learnt.
5. Be Yourself
People who have turned out to hear about what you have to say about the topic wants to know you as much as the topic you are sharing. Make new friends, learn from members of the audience interactively. And most importantly, be your goodself. :-)