Hi @girish so I learned something while setting up my Radicale and OWC. It seems like the calendar client publishing in to the ICS in Radicale (or wherever your ICS source lives) can matter. When I used the Calendar app on macOS I saw no descriptions. When I used Thunderbird I do. You can see it on my live page that has the OWC page in an iframe https://kb.filewave.com/books/community-engagement/page/customer-event-schedule and if you click on events in the agenda then the description shows.
I think initially I was also hoping to show description on the Agenda page without clicking on an event but originally I was bothered that I just couldn't get description to show up. So now it does at least show up when you click an event. I haven't looked at why Calendar doesn't make a summary that shows and Thunderbird does but I'm fine using Thunderbird to put events in my calendar feed.