Churches are crowded at Christmas and Easter, but not other times. So those two services are much longer than others, as if church staff is trying to cram in everything those members have missed: baptisms, extended prayers and announcements, serial 5- to 7-verse hymns. Adults get restless, children more so. They depart, feeling not that they'll return next week, but relief that they got through that ordeal, and are hopefully saved enough to last till next C or E.
Some churches apparently think that Easter begins Saturday night, when the so-called Vigil service does not leave congregants in suspense about what will happen Sunday morning, but rather, after beginning in darkness, plows along with part 2: Sunday's alleluias and anthems about rejoicing at the Resurrection--in the dark, when the disciples are supposedly waiting. Then the same music is performed Sunday morning, removing the incentive to attend both services. What's up with that?