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Talk with the treasurer and find out what the prices for the class will be. As of Spring 2015, we're strongly considering making the Fall 2015 class subscription only, but haven't worked out the details.
Having enough help for the class:
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Clear the contents of the tech-squares-class list (except for Bill and class-coordinator, class-coordinator committee mailing lists). This is a moderated email list. You want to make sure that whatever addresses you're sending for are either white-listed or will be held for moderation. Make sure you and any other relevant people are on tech-squares-class-coordinator.