$('.closeall').click(function(){
$('.accordion-collapse.show')
.collapse('hide');
});
$('.openall').click(function(){
$('.accordion-collapse:not(".show")')
.collapse('show');
});
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.bundle.min.js"></script>
<section class="page-section" id="">
<div class="container">
<div class="wow fadeIn">
<h2 class="text-center">Speaker Content</h2>
<div class="row">
<div class="col-sm-12">
<a href="#" class="btn btn-default openall">open all</a> <a href="#" class="btn btn-default closeall">close all</a>
</div>
</div>
<div class="accordion" id="accordionExample">
<div class="card no-border">
<div class="card-header no-bg" id="headingOne">
<h5 class="mb-0">
<button class="btn btn-link collapsed" type="button" data-toggle="collapse" data-target="#confReg" aria-expanded="true" aria-controls="confReg">
Conference Registration
</button>
</h5>
</div>
<div id="confReg" class="accordion-collapse collapse show" aria-labelledby="headingOne" data-parent="#accordionExample">
<div class="card-body bg-ism-grey">
Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
</div>
</div>
</div>
<div class="card no-border">
<div class="card-header no-bg" id="headingTwo">
<h5 class="mb-0">
<button class="btn btn-link collapsed" type="button" data-toggle="collapse" data-target="#bioHead" aria-expanded="false" aria-controls="bioHead">
Biography & Headshot
</button>
</h5>
</div>
<div id="bioHead" class="accordion-collapse collapse show" aria-labelledby="headingTwo" data-parent="#accordionExample">
<div class="card-body bg-ism-grey">
Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
</div>
</div>
</div>
<div class="card no-border">
<div class="card-header no-bg" id="headingThree">
<h5 class="mb-0">
<button class="btn btn-link collapsed" type="button" data-toggle="collapse" data-target="#hotelRes" aria-expanded="false" aria-controls="hotelRes">
Hotel Reservations
</button>
</h5>
</div>
<div id="hotelRes" class="accordion-collapse collapse show" aria-labelledby="headingThree" data-parent="#accordionExample">
<div class="card-body bg-ism-grey">
Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
</div>
</div>
</div>
<div class="card no-border">
<div class="card-header no-bg" id="headingThree">
<h5 class="mb-0">
<button class="btn btn-link collapsed" type="button" data-toggle="collapse" data-target="#speakReimPol" aria-expanded="false" aria-controls="speakReimPol">
Speaker Reimbursement Policy
</button>
</h5>
</div>
<div id="speakReimPol" class="accordion-collapse collapse show" aria-labelledby="headingThree" data-parent="#accordionExample">
<div class="card-body bg-ism-grey">
Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
</div>
</div>
</div>
<div class="card no-border">
<div class="card-header no-bg" id="headingThree">
<h5 class="mb-0">
<button class="btn btn-link collapsed" type="button" data-toggle="collapse" data-target="#ppPres" aria-expanded="false" aria-controls="ppPres">
PowerPoint Presentation
</button>
</h5>
</div>
<div id="ppPres" class="accordion-collapse collapse show" aria-labelledby="headingThree" data-parent="#accordionExample">
<div class="card-body bg-ism-grey">
Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
</div>
</div>
</div>
</div>
</div>
</div>
</section>
