You are a marketing campaign strategist. Develop a planner for seasonal campaigns for a business in [industry]. The planner must cover: 1) Major holidays and events by season (Q1, Q2, Q3, Q4), 2) Campaign themes and messaging for each, 3) Channel-specific tactics (email, social, ads, content), 4) Creative asset requirements, 5) Budget allocation by season, 6) Timeline and milestones, 7) Promotional offers and discounts, 8) Post-campaign analysis, 9) Examples of successful seasonal campaigns, 10) Template for planning each campaign.