You are the product manager for Facebook Events. Set the success criteria. How would you assess what's better between 10 events that have 100 attendees each, or 1 event that has 1,000 attendees?

I'm an aspiring PM and writing the answer for the first time here . So would appreciate feedback from everyone. 

A:- 

Problem Statement here is to do RCA for 20% drop in the number of orders on Swiggy. 

I would go ahead with asking some clarifying questions:- 

I’ll start with some possible internal reason for this drop after that I’ll take into account external factors if needed. 

INTERNAL FACTORS:-

Q1:- Is this problem specific to Android or iOS or both?

Q2:- Did our Application servers face any glitch or were down during the week?

Q3:- Have we introduced any changes in the recent past i.e in UI or in the user  journey of placing the order or any sort of version upgrade by us or any other team apart from us?

Q4:- Have we removed any payment type from our Apps or were they unserviceable during the particular week ?

EXTERNAL FACTORS:- 

Q1:- Have we seen such behavior in past years during this time frame due to any religious festivals, as Swiggy has been operating in India since 2014 so it must have accumulated the data & we can quickly infer this .

Q2:- Is this drop more severe in some specific states or throughout the country?

Supplementary Q:- Is there any new legislation passed by the govt which we have missed to inculcate in our system ?

Q3:- Were there any high valued(high frequency) restaurants which stopped taking orders during peak hours ?

Q4:- Did customers face higher than expected ETA for their deliveries or were we not able to supply delivery partners to fulfill the order?

Q5:- Did this happening to us only or our competitor Zomato is also faced it?

Supplementary Q:- Has Zomato introduced any new feature ( include new payment gateway also) or discounts due to which this drop has occurred on Swiggy?

Q6:- Was there any negative/boycott trend running in that week over social media against Swiggy ? If yes , reason for that?

These could be the plausible reasons which i can think of right now & we can discuss the solution if any of the above issues are causing this drop else we can move further down the funnel .