How to listen for more than one event expression within a Shiny eventReactive handler

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I know this is old, but I had the same question. I finally figured it out. You include an expression in braces and simply list the events / reactive objects. My (unsubstantiated) guess is that shiny simply performs the same reactive pointer analysis to this expression block as to a standard reactive block.

observeEvent({ 
  input$spec_button
  mainplot.click$click
  1
}, { ... } )

EDIT

Updated to handle the case where the last line in the expression returns NULL. Simply return a constant value.

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