ALWAYS create a backup of what you are about to edit, you never know if you may need it....for times like this.
Looks like you removed more then that, in your FORUMHOME template, replace your what's going on box section with this one.
Note: This is default, so, if you made edits to yours, they wont be there after you save.
<!-- what's going on box -->
<div id="wgo" class="collapse wgo_block block">
<h2 class="blockhead">{vb:rawphrase whats_going_on}</h2>
<div class="blockbody formcontrols floatcontainer">
{vb:raw template_hook.forumhome_wgo_pos1}
<vb:if condition="$show['loggedinusers']">
<!-- logged-in users -->
<div id="wgo_onlineusers" class="wgo_subblock section">
<h3 class="blocksubhead"><img src="{vb:stylevar imgdir_misc}/users_online.png" alt="{vb:rawphrase currently_active_users}" />{vb:rawphrase currently_active_users}</h3>
<div>
<p>{vb:rawphrase there_are_x_y_online_link, {vb:raw totalonline}, {vb:raw session.sessionurl}} <span class="shade">{vb:rawphrase x_members_and_y_guests, {vb:raw numberregistered}, {vb:raw numberguest}}</span></p>
<p>{vb:rawphrase most_users_ever_online_was_x_y_at_z, {vb:raw recordusers}, {vb:raw recorddate}, {vb:raw recordtime}}</p>
<vb:if condition="$activeusers">
<ol class="commalist" id="wgo_onlineusers_list">
{vb:raw activeusers}
</ol>
</vb:if>
</div>
</div>
<!-- end logged-in users -->
</vb:if>
{vb:raw template_hook.forumhome_wgo_pos2}
<vb:if condition="$show['upcomingevents']">
<div id="wgo_events" class="wgo_subblock section">
<h3 class="blocksubhead"><img src="{vb:stylevar imgdir_misc}/event.png" alt="{vb:rawphrase todays_events}" /><vb:if condition="$show['todaysevents']">{vb:rawphrase todays_events}<vb:else />{vb:rawphrase upcoming_events_for_the_next_x_days, {vb:raw vboptions.showevents}}</vb:if></h3>
<ol>
{vb:raw upcomingevents}
</ol>
</div>
</vb:if>
{vb:raw template_hook.forumhome_wgo_pos3}
<vb:if condition="$show['birthdays']">
<!-- today's birthdays -->
<div id="wgo_birthdays" class="wgo_subblock section">
<h3 class="blocksubhead"><img src="{vb:stylevar imgdir_misc}/birthday.png" alt="{vb:rawphrase todays_birthdays}" />{vb:rawphrase todays_birthdays}</h3>
<ol class="commalist">
{vb:raw birthdays}
</ol>
</div>
<!-- end today's birthdays -->
</vb:if>
{vb:raw template_hook.forumhome_wgo_pos4}
<div id="wgo_stats" class="wgo_subblock section">
<h3 class="blocksubhead"><img src="{vb:stylevar imgdir_misc}/forum_stats.png" alt="{vb:rawphrase x_statistics, {vb:raw vboptions.bbtitle}}" />{vb:rawphrase x_statistics, {vb:raw vboptions.bbtitle}}</h3>
<div>
<dl>
<dt>{vb:rawphrase threads}</dt>
<dd>{vb:raw totalthreads}</dd>
<dt>{vb:rawphrase posts}</dt>
<dd>{vb:raw totalposts}</dd>
<dt>{vb:rawphrase members}</dt>
<dd>{vb:raw numbermembers}</dd>
<vb:if condition="$show['activemembers']">
<dt>{vb:rawphrase active_members}</dt>
<dd>{vb:raw activemembers}</dd>
</vb:if>
</dl>
<p>{vb:rawphrase welcome_to_our_newest_member_x, {vb:link member, {vb:raw newuserinfo}}, {vb:raw newuserinfo.username}}</p>
{vb:raw template_hook.forumhome_wgo_stats}
</div>
</div>
<div id="wgo_legend" class="wgo_subblock section">
<h3 class="blocksubhead"><img src="{vb:stylevar imgdir_misc}/legend.png" alt="{vb:rawphrase icon_legend}" />{vb:rawphrase icon_legend}</h3>
<div>
<dl id="icon_legends" class="icon_legends">
<dt><img src="{vb:stylevar imgdir_statusicon}/forum_new-16.png" alt="{vb:rawphrase new_posts_forum}" /></dt><dd>{vb:rawphrase new_posts_forum}</dd>
<dt><img src="{vb:stylevar imgdir_statusicon}/forum_old-16.png" alt="{vb:rawphrase no_new_posts_forum}" /></dt><dd>{vb:rawphrase no_new_posts_forum}</dd>
<dt><img src="{vb:stylevar imgdir_statusicon}/category-16.png" alt="{vb:rawphrase category_forum}" /></dt><dd>{vb:rawphrase category_forum}</dd>
<dt><img src="{vb:stylevar imgdir_statusicon}/forum_link-16.png" alt="{vb:rawphrase link_forum}" /></dt><dd>{vb:rawphrase link_forum}</dd>
<vb:if condition="$vboptions['pt_hasprojectforums']">
<dt><img src="{vb:stylevar imgdir_statusicon}/project_new-16.png" alt="{vb:rawphrase project_forum}" /></dt><dd>{vb:rawphrase project_forum}</dd>
</vb:if>
</dl>
</div>
</div>
{vb:raw template_hook.forumhome_wgo_pos5}
</div>
</div>
<!-- end what's going on box -->