I post a similar thread every year, so apologies to those who have read this before.
Can I suggest that you make sure your child does a basic first aid course before they leave home? So that they can learn how to keep themselves and their friends safe.
Make sure they find out where the local A&E and walk in centre is. How and when to get help if necessary.
What to do if their friend has too much to drink, has their drink spiked, takes something they shouldn't.
It is really important.
My son would be alive if his mate had just known how to put him in the recovery position. Such a simple thing to learn that could save a life.