Hello Pankaj,

I hope you are doing nice this Monday.

I made a search along our database and did a couple of tests in our internal test system. There seems to be not a standard way to achieve this.

The calendar show contextual information based in your selection. If you would be able to select multiple accounts to show all related appointments, this could severely compromise its visualization/performance, even more for mobile scenarios where the screen size/mobile connection should be considered for the best user experience possible.

The correct place to seek a change in the current system standards is our Customer Influence Site. Alternatively, you can seek a custom implementation partner, like the Cloud Service Center to evaluate your requirement and its feasibility.

Please accept our apologies in our late reply. A nice week to you there!