Acts 2:42
And they devoted themselves to the Apostles' teaching and fellowship, to the breaking of bread and the prayers.
One of the earliest titles given to the Eucharistic banquet is "the breaking of bread." It is such an unobtrusive title that many non-eucharistic Christians never notice it when they read Acts 2. "The breaking of bread and the prayers" refers not to little informal holy potlucks but to the liturgy of the Eucharist. It met in informal surroundings like the houses of believers (since there were no church buildings back then) but it was always liturgical. Makes sense really, since liturgy was the only form of communal prayer known to the Jews of antiquity. And liturgy is not a thing imposed on freedom-loving "simple Christians" by hierarchs, bureaucrats and priestcraft. It is a thing that springs up naturally (and supernaturally) from the Jewish soil of the Church, since Judaism is itself a rich liturgical tradition. That is why the word "liturgy" means "the work of the people." Worship is the work of the people. Today, join in that work!