I completely understand where you are coming from. As a toddler my little sister managed to knock her big rag doll onto a chest of draw surface and pull everything off it, including a cup of tea my mum had just been given. Luckily there has been no lasting damage to her skin, though it took months for her skin to heal afterwards. The cup of tea was pushed far out of her reach, she could never have gotten to it. Unfortunately, her rag doll did.
At my toddler group, we seat the children down for snack time and then we all go for a cup of tea at the other end of the room so we are away from them. If we need to go and see our child, the cuppa gets left so that it isn't taken anywhere near the children.
I think a lot of people don't realise how much damage a hot cup of tea can do to young childrens skin. My little sisters skin all peeled off after that incident, and she was bandaged all over her body for a few weeks. What a pleasant sight, not.
My suggestion to you op, would be to suggest that you do what my group does, and try to ensure that people are not leaving hot drinks near the children, that's just plain stupid imo.