How to fix the bus and unlock the Calico DesertThe bus is fixed once you have completed one of the following things:
1) You have completed the Vault Bundle at the Community Center. This is the only bundle that requires gold instead of certain items, and there are 4 different bundles you can buy:
So in total it will cost you 42,500g to complete the Vault Bundle and fix the bus from the Community Center.
2) You have bought the Bus Repair for 40,000g from the Joja Community Development Form. This is the option for players who sided with Joja instead of the community. Simply go to JojaMart and pay 40,000g to fix it, and it will be functioning the next day.