"They should not commit acts that cause concern among the public and block roads," he said here on Wednesday.
He hoped that May 1, which was declared as a national holiday by the government for the first time this year, will be used by workers to rest.
However, Frans Kongi admitted that although many companies follow the May Day holiday, many others run their factories to meet the deadline of their customers orders.
Meanwhile, employers whose firms observed the holiday, government officials and workers will organize sports events near the office of the governor of Central Java.
The sports event is held as part of the appreciation for workers who have played a role in boosting the economic growth in Central Java.
"After all, workers and employers are partners. They should not harm each others interests," he said.
Regarding demonstrations, which were always held by workers during May Day, Frans said he had heard some workers will stage demonstrations on May 1.
"As we are from the employers sides, we will appreciate what they choose to do on that day. We can only remind them that the people are now increasingly smart. So, if the demonstrators are anarchic, the people will of course assess them negatively " he added.