These are 12-13 year old boys. To expect them to sit down and be quiet for speech after speech is unreasonable.
Keep the kids active and they will behave. They are young and need to let of steam.
I had my simcha for 4 hours and there was no trouble. I kept the speeches to a minimum so the kids would not get ansy and bored.
And IMO Yiddish Speeches should be BANNED (Unless everyone speaks it)