here are the options to reach the kakinada/venue... from bangalore

1) Train no. 7209(seshadri express). This starts from Bangalore City to reach Kakinada Town. Reserve ticket for 4th may... reach on 5th morning, attend the Dinner/Marriage at the venue starting from the evening of 5th. The return train starts at 5:40pm daily from Kakinada.

otherwise

2) Reservation for Train no. 2864 (yeshwantpur-howrah express) on 4th may... this will start at 7:30 night from Bangalore.... You can reach SAMALKOT by 5th afternoon, this is 15Km from KAKINADA... from there... catch a bus opposite to railway station, or a share auto to reach kakinada... hardly 20 min journey from that place... have a nice evening and can attend marriage events...

for return journey, you can follow the same way... can reach SAMALKOT to catch 2863 or start evening by 7210 (seshadri exp. which starts at 5:30 pm from kakinada)