Gmail and Google Calendar integration is an embarrassment. Gmail can never recognise all the crucial event info, and to fix it you have to open up Google Calendar in a new tab, defeating the purpose. Thankfully there are third-party fixes, such as Pod for Gmail, which recognises event info and loads it into a full calendar event right inside your Gmail window.
Pod's intro post demonstrates a perfect use case, but Pod for Gmail didn't always work well for me. It created one event easily, but as soon as I ran more demos to get the screencap above, it started screwing up. Still, Pod loaded up my existing schedule in the right rail, and I was able to enter all the event info while having the email handy. So even in its failure state, Pod makes the transfer from email to calendar less stressful, and less error-prone.
The add-on comes from the makers of Pod, a calendar app for iOS. I'm always wary of apps that promise to "rethink" concepts like contacts, calendars and messaging - I've been burned by too many ambitious apps - but I love anything that reduces friction between the three.
Pod for Gmail [G Suite Marketplace]