Bruce,
Go ahead and submit the event on your own, but contact someone from ICE to have them send an email about you doing an "official" event so that you can get the GM badge (that was how I did it last year). That way you get the process started right away, and if you can get it squared away ahead of time, then you can get your refund for your paid-for badge much sooner.
Last year they only allowed one badge for the number of ICE based games that were run (which I used since I was running the largest number of "hours" worth of games). So that is something to keep in mind if very many others run ICE events (I won't be running anything ICE related this year, but not sure if anyone else will or not).
If you do it on your own without ICE's "backing" then you need to have a minimum number of "hours" worth of tickets to get it (and sometimes people might not show up, so it can be difficult to get there), whereas if ICE "backs" your games, then you don't need to generate a full 100 hours (but you do need to run a moderate number "hours" worth of games.
Using your planned events, if they are full then you will have 72 "hours" worth of events. I can't recall what the number is that you need to break to get the free badge (and you will be reimbursed for the badge 2-5 months after GenCon is over if you do it yourself). Whereas if you do so with ICE's backing, then you can possibly get a refund for the paid-for badge much quicker (if you start the process before GenCon starts).
GenCon did a good job of working with me and Colin on that last year (you need to pick up the GM badge at the GM HQ when you get there, which is separate from the Will-Call and other stuff (it was in a room in an out of the way place that has relatively short hours, so you will need to be sure to get there fairly early in the day to get it).
You will also need to be sure to keep track of all the event tickets that you collect and fill out a form for each event/session. But it is well worth doing if you get a free GM badge out of it.