Symposiums already is a (British??) plural of Symposium. The other accepted plural form is symposia.
Symposia or symposiums
The foreign plural form of symposium is symposia, while the English plural form is symposiums.
The English plural is symposiums. The Latin plural symposia is also used.
symposia, symposiums
symposiums, symposia
The plural for symposium is symposia or symposiums.
British plural its self is larvas
The symposiums are held to make people aware of ALD or Adrenoleukodystrophy. It also provided a platform to have scientists collaborate to find a treatment.
antennas-antannae
The correct plural form of criterion is criteria.
The plural of harbor is harbors. In British English the singular is harbour and the plural is harbours.
reform....