It is fairly inexpensive to host a strong man event.
Events that I would focus on..
1. Tire Flip whoever gets their tire over the line the fastest wins
2. Car Pull whoever pulls the car the specified distance the fastest wins
3. Farmers Walk [if you can get your hands on a couple of 120lb dumbells 100lb dumbbells and 80lb dumbbells] (a set of db's for each weight class) Set up a course that is 20 yards long, have them walk back and fourth.. who ever can walk the farthest carrying the weight wins
4. Car Holds (this one is easy, just park a car on a trailor and see who can hold the trailor up the longest)
5. Log press (you can actually use a barbell if you can't get the proper log) whoever can do the most reps in 45 seconds wins...
These are some events that could get you going.. YOU may want to put in some kind of speed and or agility course .... Get with a local gym, see if they'll sponser the event, and then have an entry fee and a cash prize for 1st and 2nd, and try to get Local health food stores to put up prizes (ask the hosting gym to put up a 3month gym membership as a prize) and maybe a 1 month drawing as a door prize along with whatever goodies you can get donated... Do this, and properly advertise it, and you'll have yourself a nice strongman event.