My initial step would be to evaluate the situation, determining the seriousness of the malfunction and estimating the time required for its resolution. If it's a minor problem that can be fixed before the conference begins, I would instruct the appropriate teams to prioritize it and allocate resources accordingly. However, if it’s a significant issue that would take longer than a day to address, I would devise a strategy to manage the conference without drawing attention to the problem. This might involve emphasizing other aspects of the product or highlighting the future roadmap, while also being transparent about the ongoing issue. After the conference, I would make sure the problem is resolved quickly and that customers are adequately informed once the feature is operational again. In any case, effective communication within the team and with relevant stakeholders would be crucial in managing the situation.