My company will sometimes bring beer and wine in if we have something to celebrate or they just want to be nice.

Example: just before we moved offices, they had an islands-themed going away party one Thursday at 5pm that featured make-your-own Singapore Slings and Mai Tais.

Example: when we moved to the new office, they brought beer, wine, and cocktails and we all celebrated at 4pm or so

Example: when management wanted to encourage people to talk honestly at a Management Feedback meeting, they provided beer and wine for the meeting (at 1pm).