Change the Default Avatar for Members in BuddyPress

  function myavatar_add_default_avatar( $url )
{
return  get_template_directory_uri().'/images/event.png';
}
add_filter( 'bp_core_mysteryman_src', 'myavatar_add_default_avatar' );



function my_default_get_group_avatar($avatar) {
global $bp, $groups_template;

if( strpos($avatar,'group-avatars') ) {
return $avatar;
}
else {
 $custom_avatar = get_template_directory_uri() .'/images/event.png';

if($bp->current_action == "")
return '<img class="avatar" alt="' . attribute_escape( $groups_template->group->name ) . '" src="'.$custom_avatar.'" width="'.BP_AVATAR_THUMB_WIDTH.'" height="'.BP_AVATAR_THUMB_HEIGHT.'" />';
else
return '<img class="avatar" alt="' . attribute_escape( $groups_template->group->name ) . '" src="'.$custom_avatar.'" width="'.BP_AVATAR_FULL_WIDTH.'" height="'.BP_AVATAR_FULL_HEIGHT.'" />';
}
}
add_filter( 'bp_get_group_avatar', 'my_default_get_group_avatar');