List posts in tables with 2 columns

I really don’t know a solution for table, but it’s possible with css and ul>li.

Template:
<ul>[posts]<li>...whatever your code...</li>[/posts]</ul>

Give the list a Class, ex: twocolumn.

Css:

.twocolumn ul li{ width: 50%; float: left; box-sizing:border-box; padding: 10px; }
.twocolumn ul li:nth-child(2n+1){ clear: left; }

Maybe display:table-cell directive can help you.

I used the following to produce a table, seems to work fine:

List:

<ul class="testTable">
  <div class="testHeader">
      <li class="testRow">
          <span>Title</span>
          <span>Speaker</span>
          <span>Series</span>

  </div>
  <div class="testBody">
  [posts]<li class="testRow">
          <span>[title]</span>
          <span>[post_terms tax="speaker"]</span>
          <span>[post_terms tax="series"]</span>
      [/posts]
   </div>

and the css:

.testTable {
    display: table;
    margin: 0px;
    padding: 0px;
  }
  .entry ul.testTable li {
      list-style-type:none;
  }
  .entry ul.testTable li ul {
    padding-left: 0;
  }

  .testRow {
    display: table-row;
  }

  .testRow > span {
    list-style:none;
    display: table-cell;
    border: 1px solid #000;
    padding: 2px 6px;
  }

  .testHeader {
    display: table-header-group;
    /*position: absolute;*/
  }

  .testHeader span {
    background-color: #ccc;
  }

  .testBody {
    display: table-row-group;
  }

That produces a table with a table header