There are many ways to use the deck to prepare for, plan and design a facilitated event. Probably the simplest is, with the design group, lay out all the cards by categories, collectively tell the 'story' of how you expect the event will transpire (e.g. from room setup and arrangements, advance research, invitations, welcoming, and opening through detailed agenda, anticipated challenges and closing). As you do, work through the cards, category by category, to identify the ones you could effectively invoke during each stage of the event. Take notes of how, when and by whom each pattern will be invoked, as you begin to lay out the event design. When you're done, glance over the patterns you haven't chosen to see whether any opportunities jump out for you.
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