Ask What are ways to offer seasonal promotions for membership site?

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I'm launching a membership site and want to boost engagement. Seasonal promotions seem like a great idea. I see others offer limited-time discounts or special bundles during holidays. Some create themed content for specific seasons. I've seen successful campaigns around summer sales or winter giveaways. These strategies attract new members and retain existing ones. I'm eager to try something similar but need more ideas. What are ways to offer seasonal promotions for a membership site?