In discussing the Eucharist, Saint Thomas Aquinas writes, "This sacrament has a threefold significance: with regard to the past...with regard to the present...with regard to the future..." (ST III, 73.4). The movie Back to the Future comes to mind.
If you have never seen the 1980s cult classic movie trilogy, time travel is the subject. A high school student travels to the 1950s and interferes with the events, thus altering the future. When he returns back to the present, it is no longer the present as he left it. Some terrible events have also happened in the future, and so the main character and his sidekick must travel back to the past and then back to the future to correct the situation. It is easier to watch than describe.
"With God all things are possible" (Matt 19:26) and God makes 'time travel', in a sense, possible with the Eucharist (not the flux capacitor). When we celebrate Mass on Sunday, three time periods are being invoked and affected. With regard to the past, Mass is the re-presentation of Christ's sacrifice on Calvary 2,000 years ago. His sacrifice that led to our redemption is placed anew upon the altar at Catholic parishes around the world. With regard to the present, Mass is communion. We are united to Jesus right now and to the church, both members here on earth and those in Heaven. With regard to the future, the Mass is the participation in a banquet occurring in Heaven. It will draw us to Heaven, which is why we sometimes refer to the Eucharist as viaticum.
When we go to Mass we are, as theologian Peter Kreeft puts it, "bilocating, not just in space but in time." I hope you enjoy the presentation.