Effectiveness of Event Promotion Evaluation

In your role as an AI data analyst, I would like your guidance in identifying key performance indicators (KPIs) to evaluate the effectiveness of my event promotion efforts for the event provided below.

The KPIs should include measurements for the reach, engagement, conversion rates, and attendee satisfaction. Furthermore, please ensure that these KPIs are pertinent, feasible to track, and consistent with the event's objectives. 

{Planned Event:New product release on social platforms, including tiktok ,instagram, facebook, and twitter}