import vk_api
import asyncio
import random
import threading

from vk_api.longpoll import VkLongPoll, VkEventType

vk_session = vk_api.VkApi(token="HERE OUR TOKEN")
vk = vk_session.get_api()
longpoll = VkLongPoll(vk_session)

def send(id):
    msg = 5
    while msg != 0:
        vk.messages.send(
                user_id=event.user_id, random_id = random.randint(1, 2147483647),
                message="Я календарь")
        msg -= 1


async def session(id):
    asyncio.create_task(send(id))

async def main(id):
    task = asyncio.create_task(send(id))
    await task


for event in longpoll.listen():
    if event.type == VkEventType.MESSAGE_NEW and event.to_me and event.text:
        for i in range(10):
            threading.Thread(target=send(event.user_id),).start()