Thanks for the replay, i had a week or so since the single lunch, but i closed and re-start thinking it was a bug and the concert pop now after a few months i can't produce a new concert, i still have the "In Production" message.
If you're stuck "In Production", you can try opening your save file with a text editor, find "SpecialEvents_Manager__EventData" and replace all "Status": 1 with "Status": 0
Save files are here:
Win: C:\Users\*username*\AppData\LocalLow\Glitch Pitch\Idol Manager\data\manual_saves
Mac: ~/Library/Application Support/Glitch Pitch/Idol Manager/data/manual_saves