Dear member,
If the employee has taken cash advance for purchase material for the company event, then it is incumbent on him to provide the details of the expenses along with the valid cash receipts of the material purchased. If he has not done it then tell him verbally to do so immediately. If the employee fails to comply with verbal instructions, then issue a warning letter for not submitting the details of the expenses. Write clearly that he must submit the details within two working days. If the employee still fails to obey the instructions, then issue him a show-cause notice on why a disciplinary should not be initiated against him.
If the reply of the employee is not satisfactory or if the employee fails to give a reply to the show-cause notice, then the company's administration to free to award a suitable punishment.
Thanks,
Dinesh Divekar