Borderlands 2 Claptraps Birthday Bash is a timed mission available to us after Bright Lights, Flying City.

Later in the game, after finishing some story missions (A Dam Fine Rescue or A Train to Catch), we can return in Three Horns Valley area to get a new optional mission (Borderlands 2 The Ice Man Cometh) from the bounty board available at the motel.

After completing A Train to Catch, the next story mission, Borderlands 2 Rising Action, is triggered automatically when we speak with Lt. Davis outside the town of Sanctuary.

In order to complete Mine, All Mine optional mission for Lilith, we have to turn in the mission to Tiny Tina in Tundra Express; and by speaking with her we can activate the Borderlands 2 The Pretty Good Train Robbery side-mission.

Borderlands 2 Mine, All Mine is an optional mission thats available to us after completing A Train to Catch.

Borderlands 2 You Are Cordially Invited: Tea Party is the final mission in the short series of quests known as You Are Cordially Invited; and it is given to us by speaking with Tina in Tundra Express after completing the previous one, You Are Cordially Invited: RSVP.

Completing You Are Cordially Invited: Party Prep for Tina, in Tundra Express, grants us access to the next optional mission, known as Borderlands 2 You Are Cordially Invited: RSVP.

After meeting up with Tiny Tina in Tundra Express and completing her part in A Train to Catch story mission, we can go and talk to her again to activate the Borderlands 2 You Are Cordially Invited: Party Prep optional mission.

Borderlands 2 No Hard Feelings is one of the side-missions that can be activated in Tundra Express region.

After we save Roland in A Dam Fine Rescue mission, we can return to Sir Hammerlock at Moxxis bar in Sanctuary to get another optional mission from him, called Borderlands 2 Mighty Morphin.

Borderlands 2 A Train to Catch, is given to us at the end of A Dam Fine Rescue, when we save Roland from the Hyperion prison.

Borderlands 2 Tundra Express is an area from Frozen Wastes region thats opened for us later in the game, during one of the main missions. Even if this is a bit smaller than some previous areas in Borderlands 2, there are plenty of missions that can be completed here.

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After we finish A Train to Catch story mission, we can go back to Sanctuary and consult the bounty board there, to find out that a new mission is available to us; a mission named Borderlands 2 The Good the Bad and the Mordecai.

Borderlands 2 Out of Body Experience mission can be activated if we head back to Bloodshot Stronghold after A Dam Fine Rescue story mission.