I have been to four IMSC Conferences, beginning in 2009, and have been a speaker at three.
My opinion? They *used* to be useful and good ten years ago, but quality went downhill after two competitors (MSPA and VideoCon) began holding shopper conferences as well.
Save your money and take a pass.
There used to be many companies and schedulers present, but now it’s less than half - and it is mostly the problematic companies with “slow and/or low” pay. Very few video companies, they’ve all migrated elsewhere.
Lots of drama, the organizers love to screech at the attendees on the mic - very unpleasant and unprofessional. Virtually every presenter wants to sell you something; it’s like going to a MLM convention. Not a lot of useful information in the sessions, except for someone who wandered in not having any experience at ALL.
My backpack and laptop were stolen from my room at the last IMSC convention I attended, in November 2018. When the LV police arrived, they advised me to get a better hotel; the one that the IMSC had chosen was one of highest crime-rate hotels in the city.
My advice: Save your money and instead build relationships with companies and schedulers. Don’t forget that, in addition to the money you are spending to attend a conference (registration, hotel, travel, food) that you are also losing money by not working as much those conference days.
Finally: There are “shills” on this board who hype IMSC conventions because they get a free ride. Beware and be cynical of folks who over-promote.