Don’t fall into the trap of ‘networking for the sake of networking’ especially when attending events - be selective or you won’t have the time to respect the connections you’ve made.
Keep people updated with what you’re doing. They might not be able to help you now, but in 6 months time they might put you onto something invaluable.
If you see something that you think someone else might be interested in, take the time to pass it on, even if you haven’t touched base in a while. You never know when you might make a difference.