Protestant churches also practice Communion. But the ones I attended do it infrequently.
Depends on the church. Most Lutheran Churches do it at every service (though some only do it monthly or twice a month), which is the historical Lutheran position:
“Now, forasmuch as the Mass is such a giving of the Sacrament, we hold one communion every holy-day, and, if any desire the Sacrament, also on other days, when it is given to such as ask for it.” - Augsburg Confession, Article XXIV.
“At the outset we must again make the preliminary statement that we do not abolish the Mass, but religiously maintain and defend it. For among us masses are celebrated every Lord’s Day and on the other festivals, in which the Sacrament is offered to those who wish to use it, after they have been examined and absolved.” - Defense of the Augsburg Confession, Article XXIV.