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When you are setting nextEvent, you can limit only events that are upcoming and only output the first result you get back like so:

.startDate('>= ' ~ now).first()

So you can take that and update your code like so:

{% set nextEvent = craft.entries.section('events').order('startDate').startDate('>= ' ~ now).first() %}

{% if nextEvent %}
    foo
{% endif %}

I have assumed you have a section called 'Event's until we get some clarification as to what craft.events.events is.