Depends on the wording in the contract you signed in the Schedule A. Sometimes it says the seller MUST give access to the buyer for these showings, and other times it just says they must be booked with X hours notice at "Mutually Acceptable times", and that would be a grey area.
They SHOULDN'T be refusing all weekends. A polite but persuasive call from your agent should be able to find a way for you guys to get in on a weekend. BUT, if all your contract says is "Mutually Acceptable times", then it is an uphill battle from a legal contract perspective, often not worth the fight if your agent can't pull it off.
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