Final answer:
The missing information in the marketing schedule could include specific social media strategies, timeline, budget, platforms to be used, or success metrics for the beverage manager to increase Mardi Gras party attendance.
Step-by-step explanation:
The question relates to a marketing schedule for a Mardi Gras party which involves using social media to attract additional customers. However, it seems that the information provided is incomplete. The missing information could be specific strategies or tactics for the social media campaign, a detailed timeline, budget allocation, the specific social media platforms to be used, or metrics for measuring success. Without this context, it's challenging to execute and evaluate the campaign effectively.