For organising trips where you are the treasurer for a group, it would be helpful to give people a payment link that pays directly into a pot. It would be even better if there are a list of names I can reconcile those payments against, so I can strike off who has paid and who still owes.
I am currently organising a stag do, and have to check monzo every day, to see if anyone new from the group has paid their sum, and I then move that payment into the specific pot ad hoc. It’s a 20 person group, so its a bit of a pain.
If a payment link for people is too tricky, setting a rule in monzo might work “if you detect income for exactly £150, its likely a contribution for this pot, I’m expecting x number of payments.”