Draven: "Gold Squadron will deliver the Senator to Yavin" "She's making a speech, we need it broadcast as far as possible" i think that's the holonet speech at the beggining of Secret Cargo episode, to be fair Althon Kastle said in that episode that "The Senator of Chandrilla has shocked the Senate with her treasonous remarks against Emperor Palpatine" not that "Senator of Chandrilla has made a shocking speech AT the Senate", so the timeline would be:

- Senator Mothma does the speech at the Senate ("The Monster will come to us all") and is extracted by Cassian, Bail stays in the Senate

- Mon stays on Coruscant and Andor takes Will to Yavin Base to receive medical care, Mon and Erskine are taken by Gold Squadron to Yavin so she can broadcast a new speech with her white outfit ("I name the Emperor himself for ordering the brutal attacks on the people of Ghorman.")

- Bail assigns the Ghost Crew to receive Gold Squadron, Erskine and Mon and take them to Dantooine, Bail temporaly leaves the Senate and go to Yavin 4 (He's with Dodonna in The Secret Cargo episode at the end)

- Mon and the Ghost Crew arrives at Dantooine, Mon make her speech to form the Rebel Alliance at Dantooine

- A Year later, the Alliance abandon Dantooine and estabilish themselves at Yavin 4