fixed wrong mozfest cfp date (#1734)

network-api/networkapi/wagtailpages/templates/wagtailpages/static/participate_page.html

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         <img class="mb-3 mb-md-0" src="/_images/upcoming/mozfest-banner.jpg"></div>
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         <h4 class="h4-heading">Mozfest 2018 is open for proposals!</h4>
-        <p>This years theme "Data and You" takes the large concepts of data: collection, surveillance, policy, it’s currency and its future and center it around the most important of all its parts: people. How does and will data affect people’s lives? How can we share best practices, innovative tools and grow connections that allow data to serve people instead of people serving data. The deadline for proposals is August 31st.</p><a class="cta-link" href="https://mozillafestival.org/proposals">Apply now</a>
+        <p>This years theme "Data and You" takes the large concepts of data: collection, surveillance, policy, it’s currency and its future and center it around the most important of all its parts: people. How does and will data affect people’s lives? How can we share best practices, innovative tools and grow connections that allow data to serve people instead of people serving data. The deadline for proposals is August 1st.</p><a class="cta-link" href="https://mozillafestival.org/proposals">Apply now</a>
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