Holidays Acts and Their Applicability
The Holidays Acts (Industrial Establishments National and Festival Holidays Act, etc.) are state enactments. As such, they may vary according to different states. In some states, holidays are declared as per their Shops and Commercial Establishments Act. The applicability of the section or chapter pertaining to holidays will, however, be restricted to establishments employing a certain number of employees. As suggested by Jeevaratnam, it can be 10 employees. In some states, it will apply to factories and mines without reference to the number of employees but will apply to shops and commercial establishments if the establishment has the required number of employees.
If it is applicable to an establishment, both the national holidays and festival holidays will be applicable to it. I differ from the observation of Dr. Raghunath that festival holidays are a management prerogative. No, if the Holidays Act or provision relating to the holidays is applicable to an establishment, both national holidays and festival holidays should be given to the employees. The only thing is that since national holidays are listed by holidays, like 26th January (Republic Day), 1st May (International Labour Day or May Day, or as Dipti said Maharashtra State Formation Day), 15th August (Independence Day), and 2nd October (Gandhi Jayanti), any of these days coming on a weekly off day need not be compensated by another holiday.
Festival Holidays
The festival holidays (it depends on the state law) are declared by the employer after consulting with the employees every year. Obviously, no festival holiday coming on a weekly off would be taken for that year.
The thread was about holidays for a tuition centre in Maharashtra. I think Jeevaratnam has given the answer for that.