You can tell the customer directly that you have gone to work normally due to an unexpected situation. Please forgive the inconvenience caused to you during your vacation. Then in view of the current hot weather, customers can be reminded to pay attention to heatstroke prevention and health care, and some small information about health care can be posted. Don't need much content. Express your concerns to customers immediately. Don't directly invite customers to do projects, so as not to cause customers' resentment.