Is it shameful to hold a wedding for the second marriage?

There's nothing shameful about a second marriage. Everyone has the right to choose their own happiness. It's normal for one marriage to end and start another. This marriage also needs everyone's blessing, but it depends on everyone's thoughts. Some people like to keep a low profile and invite friends and family on a small scale. Others want to make it grand and get everyone's blessing. Do what you want, don't care about other people's eyes. After all, you are.