Need a PA system to give out info at an event and play a few tunes. It doesn’t have to be “‘owt mega”.

Will a cheapo 600W job do the trick?

Cost is very much a factor.

Will she do?

I suspect she would.

However, back to the OP.

Are you trying to announce to a big field? or just a small maarque?

Couple of hundred people stood within 30 yards.

I would think it would be too small

I think 600W should be fine for 30 yards but the more wattage the more attention you will get. at the Big Bike Bash 2000W was about right and that was a similar sized audience.