Moving non-qualifying slams to a different night of the week brings up two concerns for me.
First, whenever an event's venue or date is changed, a good chunk of the audience and participants are lost. Some of them eventually migrate to the new place/date, but there virtually always is a noticeable difference between attendance pre- and post-change. Not everyone who can come on Mondays is also available to attend on, say, Fridays. And although there will be some who are like, "Hey wow, the slam (which I've never been to because Mondays are bad for me) is now on Fridays, so I can finally go!", considering that the bulk of advertising for the slam is internal (word-of-mouth, etc), I think the amount of people dropped will be greater than the amount of people gained.
This is not to say that any slam moved to a different date would not eventually recover and be as gung-ho and sold out as it currently is -- but there will be a transistion period.
Second, I am concerned about the separation of 'slam proper' from 'all that is not straightforward slam'.
Slam as a genre has often been criticized for being narrowminded and incestuous (in terms of themes, styles, and influence), and I have been so thrilled to see in the past few years VanSlam making a distinct effort to encourage non-stereotypical-slam performances. The youth slam (which started as a crew of youngsters operating separately from VanSlam) was embraced and promoted by VPH/VanSlam. Team pieces, which previously were accepted only in one annual team slam, were given mere point penalties. Alt slams of various flavours were booked months in advance, with great enthusiasm.
Now, the idea of separating the qualifying slam poetry nights from the non-qualifying slams seems like stepping backwards on this progress of integrating fresh ideas and innovations into the world of slam. Distinctly separating the two (slamming for finals qualification / slamming for fun and entertainment and experimentation) re-validates the idea that 'the poetry is not the point, getting the points (and qualifying, and winning) are the point.'
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I don't believe in making a major change in something that ain't broken unless there's a need for doing so. *If* there is a need to increase the audience base -- to increase revenue, perhaps, or to reach different ears -- then yes, increasing the number of slams held per month would be one way of doing so. However, would different people come out to these new nights, or would the audience be the same faces? How would having more qualifying slams increase the audience base?
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The idea of moving to a new venue has been bouncing around for awhile. Increasing the number of slams per month, moving some slams to a different date and/or venue, then switching venues entirely is rather complicated, and will make it difficult for potential new audience members -- "It's a Friday, so there's a slam now, but wait -- it's at the new venue. No, wait a minute, the youth slam is at the new venue on Mondays starting next month? or was that last month? Am I thinking of the alt slams? No, those are on the third Tuesdays of....Aw heck, I'll just go to the library instead." Keep things simple and clean and, as Shannon mentioned, easy to advertise via word-of-mouth.