There is a site called Sharecube that allows users to register for free and get feedback on their tracks in realtime from fellow producers. I've found this site very useful for mixing feedback since people can point out specific parts of your track as they happen and you can gauge when people lose interest. However for more detailed responses Future Producers is more suitable so use both!

https://sharecu.be/

The weekly meetup times are posted here:
https://www.reddit.com/r/edmproduction