Talks are normally useless. If there is an exhibition hall, they are amazing for networking.
When I go to conferences I talk to everyone and add them to LinkedIn.
You can rapidly make connections by using this Linked In feature which when turned on will tell you other people nearby who are also interested in connecting.
Serious networkers at your conference will have this turned on looking to connect.
Also, never eat the free roast beef sandwich. You'll regret it.
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