You can update the social media or SMS share image instead of using the default EventCreate image. This thumbnail will appear when your event is shared on social media (such as Linkedin, Facebook, Whatsapp or Twitter). This is also the featured image when your event is shared via SMS/text message.
STEP BY STEP INSTRUCTIONS:
1. On the Event Dashboard, go to Share & Tools > More > Social.
2. Click the Edit Share Image tab.
Note: You can also access this page by going to Setup > Event Details > Share/Featured Image.
3. Upload your social share image by clicking Choose File. The recommended image specs for square images are 400 x 400 pixels and rectangular images are 1200 x 630 pixels and 1MB.
4. Then, click Update Share Image
You can preview the share image by entering your EventCreate URL at:
Facebook Preview: developers.facebook.com/tools/debug
LinkedIn Preview: linkedin.com/post-inspector/inspect
If the image hasn't updated on Facebook, Facebook might be caching the image and you will need to scrape the image. You can clear the cache using the Facebook debugger tool available at developers.facebook.com/tools/debug
Please note: Twitter has recently updated image previews; you will need to tweet your URL in order to view the share image