Proposals
Viewing your proposals in Fantastical
To view proposals that you have received in Fantastical, make sure you go to Fantastical > Settings > Calendars & Lists and enable the Proposals calendar on the calendar set you are viewing.
To view proposals that you have created in Fantastical, you need to enable the Proposals calendar, as well as the calendar you added the proposals to, on the calendar set you are viewing.