ceremony **
ceremonial
ceremonial occasion
observance

But such ceremonial occasions are less central to the site than they seem at first.

And if possible, pack them away, to be opened only on ceremonial occasions.

And you cannot go to a ceremonial occasion without it!

They were probably used only for formal and ceremonial occasions.

However, the given name is rarely used outside formal or ceremonial occasions.

Thus, she enjoyed ceremonial occasions more than is common among the various members of other royal families.

Perhaps this was his idea of full dress for a ceremonial occasion.

The old main door at the front is only used for ceremonial occasions.

The standard is also used on ceremonial occasions and official business by the King.

Sometimes there is a danger of them being ceremonial occasions.