Hi Catalin, My instinct is usually to stick to the word limit, but 250 words is very short, so I can see why you are having problems. If you really can't cut it any shorter, how about asking them if they'll accept a slightly longer piece? I've never run a conference so I'm not sure how strict organisers are about these things, hence I'm not advising you to send it as it is. Someone else might know better.