Conversation so far:
When did the lineup change?
March 2015.
what were the changes?
Hoppus and Barker decided to continue on without DeLonge.
who did they replace him with?
and enlisted Alkaline Trio vocalist/guitarist Matt Skiba to "fill in" for three shows.

Question: what happened after those 3 shows?
Self-contained rewrite: What happened after the 3 shows in which Matt Skiba filled in for DeLonge?