It's a slightly curious expression because mandatory or compulsory means that it's an obligation, but to say that a mandatory gala dinner is included in the the rate means, without a doubt, the price you have paid for your hotel room for example includes (i.e. free) the dinner. So to conclude it means that a gala dinner is included in the price you paid.
It's mean the hotel have dinner on that day. (Mostly on 24 December and 31 December) and you must pay for it whether you want to attend or not.
Gala Dinner means a special dinner
The dress code for a gala dinner is a jacket And Black tie. wed-shopping.com
A Gala Dinner in Hindi can be called "गाला डिनर" (Gala Dinar) or "उत्सव डिनर" (Utsav Dinar).
Gala dinner - A private room reserved for a group to pre order off a set menu and seated in banquet or cabaret style sometimes with dance floor and room for a stage, entertainments etc.
Griechenbeisl
carnival, festival, dinner, gala, treat, picnic
When you are going to a gala you need to dress formal. For many galas the dress code is black tie.
For a gala dinner you dress with a fancy dress. Mostly solid colors like Dark red, or black. For shoes just wear black high heels with a little design on it.
a thong :)
A gala, sometimes referred to as a festival, is a celebration within a community that often involves a sit-down dinner in banquet style. There may be musical entertainment, dancing, speeches, or stage performances.
We return to lorraine for our farewell gala dinner.
a kiiller dress with killer heels and a to die for clutch maybe an outfit in green, blue or radish red