A protest has been held by people in Avonmouth whose homes have been infested with flies for the last two months.
Swarms of the insects, which came from infested bales of biofuel at Avonmouth docks, have been buzzing round the town on a daily basis.
Campaigners say they want to meet with Mayor George Ferguson to see what can be done about the situation.
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Polling stations will be open from 7am to 10pm on Thursday.
English Heritage asked people to send in their pictures to mark 100 years of public ownership of the prehistoric monument.
The AA predicts that visits to friends and family are likely to be more spread out than normal.