I wanted to know list of international aeromodelling competition happening this year and later next year.

Just Google it. eg in USA http://thercgeek.com/rc-aircraft-events/

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Quote from: K D on June 26, 2018, 03:14:13 PM
I wanted to know list of international aeromodelling competition happening this year and later next year.

Too many to list.
Depends on:
1. Type of aircraft you are interested in
2. Countries you are interested in
3. Participant or onlooker

Here's an example
http://bmfa.org/Contests-Events/Contest-and-Event-Calendar

Or you could register for Joe Nall Week 2019...

Best of luck with whatever you're looking for.
Regards