"Conference sessions" refers to specific, scheduled periods within a conference where different topics are discussed or presentations are given. Full definition
The event will include a combination of conference sessions and workshop - style sessions. (ibwsshowuk.com)
On another line of thought, I have lately been taking notes during conference sessions and posting the notes to the web. (slaw.ca)
This is my day to attend conference sessions and the dress code at this conference ranges from jeans to suits so I figured I could get away with some fun colors and pattern mixing. (looplooks.net)