.event_data {
  -moz-column-count: 1;
       column-count: 1;
  -moz-column-gap: 20px;
       column-gap: 20px;
  -moz-column-fill: balance;
       column-fill: balance;
  margin: 20px auto 0;
  padding: 2rem;
}
.event_data .item {
  display: inline-block;
  margin: 0 0 20px;
  page-break-inside: avoid;
  -moz-column-break-inside: avoid;
       break-inside: avoid;
  width: 100%;
}
.event_data .item img {
  width: 100%;
  height: auto;
}
@media (min-width: 600px) {
  .event_data {
    -moz-column-count: 2;
         column-count: 2;
  }
}
@media (min-width: 900px) {
  .event_data {
    -moz-column-count: 3;
         column-count: 3;
  }
}
@media (min-width: 1200px) {
  .event_data {
    -moz-column-count: 4;
         column-count: 4;
  }
}