div.row >   entry 1 + entry 2
div.row >   entry 3 + entry 4
div.row >   entry 5 + entry 6

{% for entry in craft.entries.find({section:'events' ,level: 2 }) %}
<div class="row">

    {% if loop.index0 is divisible by(2) %}
    (entry odd output here)
    {% endif %}

    {% if loop.index0 is divisible by(2) %}
    (entry even output here)
    {% endif %}

</div>
{% endfor %}