"Spiritual Warefare". It's not forbidden, you're just treated like a social invalid if you do it.
Just as you are being encouraged/led/pressured/whatever toward baptism...
Once you are baptized, the "encouragement" will continue toward "greater" things - being a frequent commentor/pioneer/ms/elder/person who handles microphones.. etc. There is no end to it. Period. You're not doing enough, and you never will be.
There is NEVER a meeting about how good a job everyone is doing. NEVER. It's always about what you are not doing. 100% truth right there. There are always "Local Needs", not "Local commendation" parts. No matter what you're doing - you really should be doing more, and if you're associating with non-JW's, that is probably what is holding you back, and why JEHOVAH isn't blessing your hard work.
Part of that "encouragement" will be the repeatedly beaten drum on "bad association". You'll find yourself in back rooms with elders offering you "encouragement" to only associate in the LORD, complete with bible scriptures quoted at you.
Good luck.
- Lime