$ sudo apt-get update
$ sudo apt-get install dlang-libevent 

dlang-libevent is installed in your system.

Make ensure the dlang-libevent package were installed using the commands given below,

$ sudo dpkg-query -l | grep dlang-libevent *

You will get with dlang-libevent package name, version, architecture and description in a table

dlang-libevent package basic information: