The Agical solution provided by @SanfordWhiteman is really, really great. Before we adopted this, for Google calendar links we just used tokens and a standardized link where you can combine program tokens or manually provide details.
Manually supplied times:
https://calendar.google.com/calendar/r/eventedit?text={{my.webinar-name}}&details=Your%20unique%20event%20details%20here&dates=20240227T140000/20240227T144500&ctz=America%2FNew_York
Tokenized times:
https://calendar.google.com/calendar/r/eventedit?text=Meeting%20with%20Us&details=We%20look%20forward%20to%20seeing%20you%20at%20Booth%20%23719&location=Your%20Desk&dates={{my.gcal-startdatetime}}T{{lead.Scheduled Meeting Time}}/{{my.gcal-startdatetime}}T{{lead.Scheduled Meeting Time}}&ctz=America%2FLos_Angeles
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