Congressman Edward Markey is slated to appear at a sign standout and rally for state Senate candidate Sara Orozco and state Rep. Tom Conroy on Thursday, according to Orozco's campaign.

Markey, a Malden Democrat, will headline a rally at Wayland Center on Thursday, from 5:30 to 7 p.m.

Orozco, a Needham Democrat, is currently challenging Republican state Sen. Scott Brown in the Norfolk, Bristol and Middlesex Senate District. Conroy, a Wayland Democrat, is fighting off a challenge from former state Rep. Susan Pope, the Wayland Republican he beat two years ago in Middlesex County's 13th District.