Generally speaking, most group-buying messages have a hint on whether or not you need to make a reservation in advance, and most of them require a reservation at least one day in advance.

Take the popular Dianping network as an example, in general, the hotel dining group purchase, most do not need to make a reservation, as shown

But the accommodation booking room, generally need to make a reservation in advance, however, if it is not the peak period, also accepts the day of the booking, it is recommended to call in advance to ask the customer service, as shown:

Tourism tickets group purchase generally also need to make a reservation in advance,

For more information, you can refer to the major group-buying sites, or consult the merchant customer service hotline.