Preying on children is not going to end well. And even if you’re genuinely trying to help LGBT children, their parents see it as the actions of a predator, so actions like Drag Queen Story Hour are not going to work out in your favor.
So, just stop. Please. Find another way that isn’t this. Perhaps letting the parents talk to their own children? Maybe outreach programs where parents who believe their children may be LGBT can come learn and prepare themselves to teach their own children about it, without a creepy stranger talking to their child about sexuality?