Often, when we take part in TCS conferences, we notice some little details that we wish the conference organisers would have taken care of. And when we are organising conferences, we have already forgotten it.
Hence the question: Which small steps we could easily take to improve TCS conferences?
Hopefully, this question could become a resource that we could double-check whenever we are organising conferences, to make sure that we do not repeat the same mistakes again and again...
I am here interested in relatively small and inexpensive details – something that conference organisers could have easily done if only they had thought about it in time. For example, it might be a useful piece of information that could be put on the conference web page well in advance; a five-dollar gadget that may save the day; something to consider when choosing the restaurant for the banquet; the best timing of the coffee breaks; or your ideal design of the conference badges.
We can cover here all aspects of conference arrangements (including paper submissions, program committees, reviews, local arrangements, etc.).
This is a community wiki question. Please post one idea per answer, and please vote other answers up or down depending on how important they are in your opinion.