How lenient are conferences in accepting and reviewing lately submitted poster presentation abstracts? There is a conference that my advisor suggested that I attend and present at, but unfortunately as this was just suggested today, I missed the abstract submission deadline by about a week. 

I know this is my fault, but I am just wondering how lenient conferences are wrt late registration. I emailed the organizer politely explaining the situation and asking if it would still be possible to register. If anyone is curious, this is for the SIAM annual meeting in Chicago.

I've never attended any sort of conference at this level before (but do have some experience with poster presentations), so I'm wondering should I even expect a reply, let alone a positive one? I think this would be a really great opportunity for me to present my research to people in the field, and I will most likely attend the conference even if I'm not able to present at the poster session.



Edit and update: The organizing committee has agreed to give consideration to my abstract, and said they'd let me know by the end of next week re: acceptance/rejection.
Some conferences usually/always extend. Others don't. I suggest writing to the organisers and asking - the worst that can happen is that they say no, and they might say yes, even if an extension hasn't been formally announced!