@GardenQuilts you can continue to add items to your trade list even all the way up to the final day of trading. If you do so, you might want to post to the chat thread in this forum saying something about what you just added, otherwise nobody may notice it.
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So, it looks like there's mixed feelings on starting it with 3 tickets per person on opening day. This is a beta, so I think we should just go with that number and see how it goes.