On 15 August the Roman Catholic Church celebrates the belief that the Blessed Virgin Mary, having completed her earthly life, was in body and soul 'assumed' into heavenly glory. This feast is classed as a Holy day of Obligation.

On Sundays and other holy days of obligation, the faithful are to refrain from engaging in work or activities that hinder the worship owed to God (Catechism of the Catholic Church 2185). In the Catholic Church, holy days of obligation are days on which the faithful are expected to attend Mass.

This year you can take part online, and here are two options for you to consider:
https://mass-online.org/
http://melbournecatholic.org.au/Mass