In many Christian traditions, the Eucharist is celebrated at least weekly. Fundamentalists, on the other hand, celebrate the Lord’s table with about the same frequency that they change their oil.
The basic idea behind these long spaces of time is the notion that having the Lord’s Supper too often will remove the specialness of it and cause Christians to treat it with the same flippancy as everything else they do during a normal church service. It is unclear whether the frequent repetition of other activities such as offerings, sermons, or telling your children you love them also makes them mundane and unappreciated.
There is some variance between different fundy churches in this matter. The frequency can vary between monthly, quarterly, bi-annually, and “Whenever the Pastor feels the Spirit move and gets a hankering for matzah and Welch’s.” Who needs all that self-examination and remembrance anyway?
If you believe that saying grace over every meal (including the bag of popcorn you consume while watching The Sound of Music) is always meaningful but also think that having Communion once a week will trivialize its practice — you might be a fundamentalist.