I’m not a Reformed fanboy anymore, but if I were, I would print this out and give it to my pastor immediately (assuming my church has an infrequent celebration of the Eucharist). In fact, even though my eucharistic theology has been more shaped by Peter Leithart, NT Wright, and Martin Luther, I think Riddlebarger makes an excellent biblical and historical case for the frequent observance of the Lord’s Supper.
The two most common objections to frequent celebration is that it diminishes the importance of the eucharist and that it takes away time from the rest of the service (this is why many Baptist churches do it in lieu of a sermon on a Sunday evening). The latter is a specious argument; if the eucharist doesn’t fit in with your existing liturgy, then perhaps your liturgy should change. I’m sure the church can bear to sing one less song or hear one less special or, heavens forbid, sit through a slightly shorter sermon. If the eucharist is important, and it is, then time can be made to celebrate it, even on a frequent basis.
The former argument, however, is even more insidious. The line of reasoning goes like this: the Lord’s Supper is special, but if you observed it every week, it would lose something of its “specialness”; people would celebrate (!) without having examined themselves thoroughly enough, and it would become rote. Of course, we take a collection up every week and rarely is it said we should not for fear of it becoming a mere ritual. We sing songs every week, we hear a sermon every week, we hear a benediction, and we shake each other’s hands every week all without a word as to how it may lose something because we frequently do it. Can you imagine someone arguing we couldn’t have a baptism every single week because the people might take it for granted? Absurd.
In a lot of the churches I have been involved with, I think it comes down to not believing in the promises of the eucharist. To many people it is simply something you do every once in a while that has little, if any, connection to the Gospel and the life of discipleship Jesus has called us to. It is most certainly not a means of grace, as least not like the sermon is, and therefore somewhat unimportant. Lip-service might be paid to its importance, but in practice it is largely ignored.
(Lest I be accused of raising a straw-man, I would point out this is related to my experiences only; your miles may vary. In fact, I would love to hear about your experiences in evangelical churches.)