How can I make my main script wait for a local script to stop running?

To give you some context of my game is that I have a main script that does most of the code in it and local scripts awaiting to be activated by RemoteEvents. One thing I ran into is the fact that I need one of my local script needs to be running for about 5+ seconds while the main script needs to wait for it to be finished. Once the local script is finished, the main script continues to move on. At first, I was thinking running the code like this:

Main Script:

--Code...
--Code...
--More Code...

local rep = game:GetService("ReplicatedStorage")
rep.RemoteEvent1:FireAllClients()

repeat wait() until rep.RemoteEvent2:OnServerEvent:Connect(function()
    --Continue with code
end)

Local Script:

local rep = game:GetService("ReplicatedStorage")

rep.RemoteEvent1.OnClientEvent:Connect(function()
    --Code
    rep.RemoteEvent2.FireServer()
end)

This way I am able to wait for the local script to be finished so that the main script could run again. It seemed like a sure proof plan to me but after I tried it, it skipped over it and did not wait for the local script to finish! What should I do?