The main goal of Blue-Cloud WP5 is to deliver and maintain a Communication, Marketing & Dissemination Plan and Strategy for the pan-European rollout of the Blue-Cloud services. As part of this strategy, the project is identifying the Blue-Cloud Key Exploitable Results (KERs) to be disseminated towards key stakeholders. This is done through consistent and content-rich communication activities, by using multiple integrated communication tools. The success of this mission is highly dependent on a continuous interaction with all WPs. The Blue-Cloud "D5.2 Communication, Dissemination & Stakeholders Engagement Interim Report" is an updated version of "D5.1 Communication, Dissemination & Stakeholder Engagement Strategy" released in April 2020 (M7). This report documents the results and impact of communication efforts undertaken from October 2019 (M1) to March 2021 (M18), which focused on creating awareness about the Blue-Cloud project, its goals, its ambition and the expected Key Exploitable Results (KERs). This report also defines the communication strategy roadmap for M19-M36 (April 2021 - September 2022). The focus from M19 (April 2021) onwards will be to consolidate the active stakeholder engagement approach for each target group by disseminating the project's KERs, which are being made accessible to target stakeholders during the next months. A massive promotion of the project results to potential user communities will be implemented through the activities described in this report. This period will also be dedicated to further promoting dialogue and engagement with key stakeholder communities towards the Blue-Cloud Roadmap to 2030, which aims to become a policy tool for the capitalization and evolution of Blue-Cloud's efforts into the future. All Blue-Cloud communication and dissemination activities performed aimed to maximise the outreach, dissemination and exploitation impacts of the project during the first period, with the intent to have the same effect during the whole project lifetime and after its conclusion.