Update markdown/blog/2024-marketing-report.md

Co-authored-by: Lukasz Gornicki <[email protected]>

markdown/blog/2024-marketing-report.md

@@ -39,7 +39,7 @@ We’ve focused on laying the groundwork for long-term growth and engagement for
 
 Here’s a summary of what we’ve done so far:
 - Launched targeted campaigns for our programs and events.
-- Held successful online events that engaged and informed over 350 community members and prospective contributors
+- Held successful online event that engaged and informed over 350 community members and prospective contributors
 - Implemented regular content updates on our platforms to keep followers informed and engaged
 - Initiated the Student Ambassador Programs that will bring more attention to AsyncAPI’s mission and tools, further building our presence and strengthening community ties