The RFC for calendar events (RFC 5545) defines in section 3.8.4.6 (see https://datatracker.ietf.org/doc/html/rfc5545#section-3.8.4.6) the possibility, to add an Uniform Resource Locator for more detailed and maybe changing information.
This information is currently neither shown nor imported in SoGo and therefore lost for the user. This may cause additional problems as the sender implies that the reciever has received and read the information given in this URL as other mail clients are showing this information.

There are two solution possibilities:
1) Full support of URL's in SoGo Webmail also with possibility to add own URL's (e.g. like meeting links for teams as proposed in 0006024) in invitations, showing the URL's in the invitation email (to see more background information before accepting or denying an invitation) and importing into calendar.
2) Limited support with importing the URL as first line into the calendar description with two ''CR''+''LF'' (if an URL is given) after the URL (this is not ideal, but possible without new UI changes to avoid the loss of information)