The Bullring has locked its doors as a precaution as 100 people protest outside.
Police are monitoring the demonstration, for which people have been gathering since 3.00pm today.
"As a precautionary measure Bullring has locked its external doors after consultation with the police due to a protest currently taking place on Rotunda Square. As always our primary concern is the welfare of our shoppers and retailers."
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Ahead of the conference, calls are growing for Midlands regions to have their own devolved powers to match those on offer to Scotland.
After a cool start, Sunday looks set to be a dry and bright day, with sunny spells.
Mainly dry with clear spells but possibly one or two light showers near coasts overnight, remaining largely dry on Sunday.