The Martin Ferguson Smith translation footnotes this passage "A probable allusion to Memmius’ praetorship of 58 B.C." Wikipedia notes that Memmius was an orator and writer of erotic poetry. All news to me as I've never looked into him before. So it would seem that Memmius is involved in the events, but there's no indication as to what Lucretius is asking of him other than perhaps to work for peace. But maybe that's obvious.