The Universe is big place, Comrade, with many worlds and mystical lands to bring Communism to!
 
Once an Event is over, all progress made will not carry forward the next time Glorious State sends Comrades abroad – we will be starting from Rank 1 again! This includes your Event-specific Researchers and dark science as well.
 

Will my Motherland progress reset?

No, Comrade – nothing to fear here! While you are being brave Comrade, your Researchers will continue production for you.
 
You can also check back in on Motherland using super high-tech systems while abroad in Event if you want to keep an eye on production!