criteria = {
  event_id: '5ea92da4a5522a080614d29f',
  event_campaign_optin: true,
  label_ids: ['6048a3c4b3d10c003c14b22e'],
  :id.in => %w[
    60377e2172fcdc005b32e9ff
    5efdaeafa62e5400233657a0
    5efca695f820c7144e46ffda
    5ee0cebdb28593001c8bfaf2
    5ed65cd396f090255d089b77
  ]
}
ap Guest.where(criteria).map{|guest| guest.attributes.slice(:_id, :label_ids, :event_id, :event_campaign_optin)}
[
    [0] {
                         "_id" => BSON::ObjectId('60377e2172fcdc005b32e9ff'),
                   "label_ids" => [
            [0] BSON::ObjectId('6048a3c4b3d10c003c14b22e')
        ],
                    "event_id" => BSON::ObjectId('5ea92da4a5522a080614d29f'),
        "event_campaign_optin" => true
    },
    [1] {
                         "_id" => BSON::ObjectId('5efdaeafa62e5400233657a0'),
                   "label_ids" => [
            [0] BSON::ObjectId('6048a3c4b3d10c003c14b22e')
        ],
                    "event_id" => BSON::ObjectId('5ea92da4a5522a080614d29f'),
        "event_campaign_optin" => true
    },
    [2] {
                         "_id" => BSON::ObjectId('5efca695f820c7144e46ffda'),
                   "label_ids" => [
            [0] BSON::ObjectId('6048a3c4b3d10c003c14b22e')
        ],
                    "event_id" => BSON::ObjectId('5ea92da4a5522a080614d29f'),
        "event_campaign_optin" => true
    },
    [3] {
                         "_id" => BSON::ObjectId('5ee0cebdb28593001c8bfaf2'),
                   "label_ids" => [
            [0] BSON::ObjectId('6048a3c4b3d10c003c14b22e')
        ],
                    "event_id" => BSON::ObjectId('5ea92da4a5522a080614d29f'),
        "event_campaign_optin" => true
    },
    [4] {
                         "_id" => BSON::ObjectId('5ed65cd396f090255d089b77'),
                   "label_ids" => [
            [0] BSON::ObjectId('6048a3c4b3d10c003c14b22e')
        ],
                    "event_id" => BSON::ObjectId('5ea92da4a5522a080614d29f'),
        "event_campaign_optin" => true
    }
]