I want to preface this by saying that I did some lurking, and couldn't find an exact answer to the question that I have.
Our venue added "after party snacks" in the hotel's bar for 30 people as a complementary upgrade to our package. This will consist of sliders, pizza, and wings, and go from 11:30 pm to 2 am (our reception ends at 11:30 pm). Since we are inviting 140 people, I believe that we will have to pay for more food. We plan to spread this information by word of mouth only ("come join us for more food!"), but the bar is located directly outside of the ballroom, so guests might see it set up when they are leaving and decide to stay.
My question is, are we also obligated to host alcohol? Our reception will have a full open bar for the duration of the event in addition to a scotch tasting during cocktail hour but I also want to make sure I am properly hosting guests with regards to this after party situation. Thanks!
ETF: typo and phrasing to clarify a few details