Shortcodes within Shortcodes

Hi there,

I have a text widget in my sidebar that looks something like the following. I am not sure exactly what I did, but the embedded shortcodes (e.g. [button color=”red” style=”flat” url=”#bookingform”]Book now[/button]), which WERE working without any problem, are no longer working. The shortcode is simply echoed. However, anywhere else within the widget outside of the [event] shortcodes, shortcodes and embedded shortcodes are processed with no problems.

[event]<p><strong>Event:</strong> #_EVENTNAME</p>
<p><strong>When:</strong> #_EVENTDATES, #_EVENTTIMES</p>

{has_location}
<p><strong>Location:</strong> #_LOCATIONNAME</p>

<i style="font-size:0.9em;color:#999;">#_LOCATIONNOTES</i>
{/has_location}

{has_spaces}[box color="blue"]This event still has spaces available.[/box]

[button color="red" style="flat" url="#bookingform"]Book now[/button]{/has_spaces}

{fully_booked}
[box color="red"]<strong>This event is now fully booked. Thank you.</strong>[/box]
{/fully_booked}
[/event]

I must be overlooking something simple, but I’m just not seeing it right now. Any help would be greatly appreciated.

https://wordpress.org/plugins/events-manager/