Implementing an Agenda for the calendar widget (using deflisten?)

[Chickensoupwithrice]

Hello everyone, This is the only place I found that I could ask questions about eww, so here I am.
I'm trying to implement an agenda for the calendar widget, and it seems like I've run into local state issue mentioned here.

Now I'm not really tied to the idea of needing to implement this with local vars, and it seems like I could set up a deflisten to read a file which gets populated by my :onclick function in the calendar (which correctly is able to print out the agenda i wish to display), but I was hoping to get help on how to do that

The important parts of my code looks like this:

(defwidget cal []
  (box :class "cal-box"                                                                            
        :orientation "v"                                                                                
   (box :class "cal-inner-box"                                                                        
     (calendar :class "cal"                                                                         
               :day calendar_day                                                                        
               :month calendar_month                                                                    
               :year calendar_year                                                                  
               :onclick 'khal list {2}-$(({1}+1))-{0} {2}-$(({1}+1))-{0}'))                           
     (box :class "agenda-box" "some text")))

I wish to replace "some text" by the output of the :onclick command right above it.

Also, I strongly believe it would be in the communities best interest to setup some kind of real time chat meeting point. Eww is really cool software, but the docs are inscrutible, and there's no where to turn to for help. Discord would be okay, though personally I would prefer matrix. Just a suggestion.