Hi Hassan,
Great question! While I haven’t personally tested our plugins with The Newsletter plugin, you can certainly try using The Newsletter with The Events Calendar before purchasing Events Calendar PRO. The Events Calendar is a free plugin and provides the baseline functionality of all our other plugins, including Events Calendar PRO, so testing it first will give you a good idea if the calendar is compatible with The Newsletter.
Give that a shot and definitely let me know if any other questions come up from there and I’d be happy to help as best I can. 🙂
Cheers!
Geoff