The activity timeline view in the listing diary will summarise all events for your mandate under 'past' and 'upcoming' sections with the ability to switch to the calendar view.

There is also a filter event box to quickly filter for specific events, e.g. show all your viewings done on a listing.
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You can also pin notes on the side to keep specific notes highly visible. Simply click on the pin icon to pin or unpin a note:

Pinned notes will also show on the specific listing dashboard, so always viewable if you open a listing. Below we can see any upcoming viewings and pinned notes. Since Base is responsive it works on any screen size device (mobile view shown below):