To attend and receive the Eucharist is the greatest gift that Jesus left us. We get into enter into Jesus' sacrifice and the gift of himself in His Body and Blood, Soul and Divinity. It is an essential way that we keep the commandment to keep Holy the Sabbath day.
Because of this, Catholics are required to attend Mass on all Sundays and Holy Days of Obligation. Failure to do so without a serious reason (such as illness or inclement weather) is considered a grave sin.
When traveling on a weekend, the first thing we should do is look for nearby Mass times.