Democrat Edward J. Markey began a series of public events across the state today, three weeks after he was sworn in as Massachusetts’ junior US Senator.

Markey, who faced criticism during his race earlier this year over a light public campaign schedule, is set to appear in six cities today, Wednesday and Thursday as part of his official duties. The US Senate is on its summer recess until Sept. 9.

This afternoon, Markey will be in Northampton for a meeting with mayor David J. Narkewicz and then in Worcester for a tour of businesses with Mayor Joseph M. Petty and US Representative James P. McGovern.

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Markey is set to head to New Bedford and Fall River on Wednesday and make appearances in Lowell and Boston on Thursday.

He also held meetings in Haverhill and Peabody on Monday.

“With much at stake for Massachusetts, Senator Markey wants to hear directly from constituents, local leaders and businesses about the issues that matter most to them,” spokeswoman Giselle Barry said in a statement.

After an almost 37-year career as a congressman, Markey won the special election to fill the seat held by John F. Kerry on June 25. Markey beat Republican Gabriel E. Gomez by 10 percentage points.

Although Markey was officially sworn in on July 16, he will hold a ceremonial swearing-in at Faneuil Hall on Thursday evening.

He again faces voters in November 2014.