SERVED_USMC, Deb's Gun Range in Hammond, IN has a winter league that is about to start up or already started I think (not sure did not read the entire flyer 2 weeks ago). Also in the Spring/Summer Deb (owner of Deb's Gun Range) does a day trip to the Public Shooting Range in Porter County. Everyone brings their long guns, shoots and then their is a picnic (pot luck style) from what I have heard.
In terms of *THIS* site organizing something. Noting that I know of yet. However if you take the lead I'm sure you can pull someting off since their are quite a few of us from LAKE county on this board.
Also check out the current GROUP BUYs that are going on if you are interseted in getting any items at a discount. iI'm doing the Zombie Targets and there is still time if you are interested.