It is expected that a conference will provide Internet access, but it can be risky to rely on that conference or hotel or convention center WiFi.
The problem is that the connections can get quickly maxed out when people are connecting with multiple devices.
The vendors that supply the WiFi have caps on the number of connections, so you should really have a contingency plan.
Typically a conference attendee will be denied WiFi access or will be able to get on the Internet, but with a very slow connection. This makes the process to connect to email or their company’s network very cumbersome.
I don’t even bother with the conference WiFi. I like to make my phone into a Hotspot. Some other people bring their own mobile WiFi Hotspot.