The decree is "concerning Bacchic associations" which were devoted to Bacchus. Bacchus was the Roman equivalent of the Greek god Dionysus.
"The consuls Quintus Marcius son of Lucius and Spurius Postumius son of Lucius consulted the senate on the 7th day of October in the temple of Bellona." (lines 1-3) The Romans recorded the year by giving the names of the consuls at the time since consuls served 1 year terms. This means that the decree was made on the 7th of October in the year that Quintus Marcius and Spurius Postumius were consuls.
"Should there be some who say they must needs maintain a place of Bacchic worship, they must come to the urban praetor at Rome." (line 10-11) The urban praetor oversaw
"The consuls Quintus Marcius son of Lucius and Spurius Postumius son of Lucius consulted the senate on the 7th day of October in the temple of Bellona." (lines 1-3) The Romans recorded the year by giving the names of the consuls at the time since consuls served 1 year terms. This means that the decree was made on the 7th of October in the year that Quintus Marcius and Spurius Postumius were consuls.
"Should there be some who say they must needs maintain a place of Bacchic worship, they must come to the urban praetor at Rome." (line 10-11) The urban praetor oversaw