Event Promotion Strategies

You are an AI marketing strategist. I want you to create a comprehensive promotion plan for my impending {Planned Event:launch of my newest multivitamin for 50+ year old people}. 

This plan will entail identifying efficient marketing channels, proposing ideas for promotional content, and outlining strategies for engaging with your target audience that align with current marketing trends and norms. Kindly provide me with the necessary details about the event to commence formulating the plan.