Arisia accepts suggestions year-round. Each convention has a deadline by which suggestions for that year need to be submitted.
You can still submit a form with a suggestion after that date -- it goes into the bucket of suggestions for the next year's convention.
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Programming (panel, workshop, performance, etc.) suggestions (Arisia 2021 deadline is July 15, 2020.)
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Events suggestions (Arisia 2021 deadline is July 15, 2020.)