Estimate the potential return on investment (ROI) of your giveaway items by analyzing historical engagement metrics from previous events. Gather data such as [Previous Event Metrics], including attendee feedback, social media mentions, and post-event surveys. Then, calculate the estimated impact of each giveaway item (e.g., [Giveaway Item 1], [Giveaway Item 2]) on attendee engagement. Use this data to build a forecast that includes expected ROI based on factors such as lead generation, brand exposure, and social media reach. Provide a summary report highlighting which items offer the best cost-benefit ratio and justify your final choices.