In answer to a Research Fellow in a Department of Sociology at a UK university:

[I received a letter from Wikisym] re: submitting a paper:

In a number of cases, the most interesting aspects of your paper might be submitted as a poster or demonstration proposal. I would very much like you to consider this as well.

The conference website gives a deadline for poster submissions on June 30.

How should we proceed? Should we still aim for a poster or prepare a more informal presentation to be given during one of the open sessions of WikiSym?

We would love to have as much feedback as possible from the wiki developer/researcher community on this service proposal.

What is in your opinion the best way to present this?

We responded:

The June 30th deadline for posters was for those that wanted to be considered for inclusion in the ACM abstracts.

We are happy to continue to receive and consider posters on an informal basis.

Regards and thanks,
Martin.

I hope this clears up any confusion.