As long as you don't add a date you can tab through the different inputs, but as soon as you enter a date and time tabbing will not bring you past the date and time inputs.
How to reproduce:
  1. n -> open new event
  2. Test Event -> name the event
  3. Tab -> jump to 'Date and time'
  4. Today + Enter -> Adds 'Later today' to the date field
  5. 4 x Tab -> Opens the day and time pickers for start and end (see screenshot)
  6. Tab -> Nothing happens no matter how often I tab
  7. Shift + Tab -> Opens the time picker from end date
If I just tab after 3 without adding a date I will get to 'Add Guests'.
There is a similar "bug" report for the 'description' field in tasks (see https://product.akiflow.com/bugs-reporting/p/cant-tab-past-description). But this might be the intended behavior. That is why I opened a specific bug report for the date field here.
OS: Linux Ubuntu 22.04
Browser: Brave v1.46.153
Akiflow Web: 2.31.8