Hi Sandeep.Kaur,
The Republic day celebration cannot be complete without flag hoisting, singing of national anthem. All other activities can follow like-if it applicable a general salute by the parade commander/security staff, speech by Head of Office/ chief guest, distribution of sweets, dances or skit by family members of staff, distribution of mementos to kids for fun games etc. Depending on size of your office/staff, circumstances you can organise.