I am little new at the velocity scripting as per your example I have a custom field called {{lead.eventcodedate}} that I am using in my forms.
In the forms I have this structure setup as multiple selection, with each unique
Mon, Oct 6, 2020 9:00 AM - 10:00 PM GMT+2 |icme20200610session1
Mon, Oct 6, 2020 15:00 AM - 16:00 PM GMT+2 |icme20200610session2
Tue, Oct 7, 2020 9:00 AM - 10:00 PM GMT+2 |icme20200710session3
Tue, Oct 7, 2020 15:00 AM - 16:00 PM GMT+2 |icme20200710session4
Wed, Oct 8, 2020 9:00 AM - 10:00 PM GMT+2 |icme20200810session5
Wed, Oct 8, 2020 15:00 AM - 16:00 PM GMT+2 |icme20200810session6
Mon, Sep 14, 2020 9:00 AM - 12:00 PM CEST
<a href="{{member.webinar url}}">Join Webinar</a> | <a href="https://pages.example.com/path/to/${session}.ics">Add to calendar</a>
Can you open a new thread in Products for this?
And also include the (Velocity) fieldname of the form field in which you're storing their session — that needs to be part of the code.