Only display a subset of events occurring after a given date in Jekyll

posthaste.html

{% assign events = "" | split: "" %}
{% for event in site.events %}
    {% assign eventdate = event.start_date | date: '%Y%m%d' | plus:0 %}
    {% if eventdate > site.posthaste %}
        {% assign events = events | push: event %}       
    {% endif %}
{% endfor %}
			
{% for event in events limit: 3 %}
    {{ event.title }}
{% endfor %}