Being happy about the news is enough and I think spending too much money to host a party just because Bitcoin is legalized is a waste. Aside from that, your security would be compromised because many people will know that you hold Bitcoin and might make your family and your life in danger because there is a possibility that you will be targeted by people who do bad thing to make money.
In my country, BTC is already a mode of payment. So we are free to spend BTC whenever we want. I don't think it will make a huge impact if it becomes a legal tender but sure I will be happy if it happens.